Rev 11:15 And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become the kingdoms of our Lord, and of his Christ; and he shall reign for ever and ever.
It's not until the seventh trumpet is sounded that the kingdoms (nations) of this world will become the kingdoms (nations) of God and Christ as He will reign now forever over the nations. Jesus has never literally sat on the throne of David in Jerusalem, but has always been at the right hand of God until all His enemies have become His footstool, Psalms 110:1-4; Isaiah 66:1; 1 Corinthians 15:24-28; Ephesians 1:22; Hebrews 2:8; 10:12, 13. This happens when Christ returns as King of kings and Lord of lords subduing His enemies and destroying the beast and false prophet and binding Satan for a time of prophetic 1000 years, Rev 19-20.
Rev 20:1-10 It's during the millennium reign of Christ here on earth that all things are subject to Christ as He destroys the enemy and cast Satan into the lake of fire.
2 Peter 3:8 is not speaking about the 1000 year reign of Christ as the context is about God's long suffering and patience from generation to generation as God is not willing that any should perish, but that all should come to repentance. There is emphases on the word "should" like that of should have, would have, could have, but many will be to late as Jesus will come on them as a thief in the night as at that time the door of Salvation will be closed forever as Christ destroys His enemies.
Rev 20:1-4 never mentions Christ literally reigning here on earth for a 1000 years. It says John only saw the future souls of those who were beheaded for not taking the mark of the beast, (not every soul that has ever died), live and reigned with Christ, but never mentions how long Christ's reign at that time is or where He is reigning from.
Jesus will never literally sit on the throne of David as this present earth and heaven will pass away then the New Jerusalem will be ushered down from heaven, Rev 21:1-3. Rev 20 shows nothing of Christ establishing a literal kingdom here on this present earth as Rev 11:15 only says at that time of the seventh trumpet the kingdoms (nations) of this world will become the kingdoms (nations) of our Lord and of His Christ. The meaning, then will all the enemies become the footstool of Christ as He makes all things subject unto Him.
Isaiah 13; Joel 3:9-17; Zechariah 14; Rev 19 speaks about the great battle against the enemies of God. When Christ returns with His army, being the host/angels from heaven who are the righteousness of God in heaven, He will then rule the nations with a rod of iron (power and great authority) destroying the enemy being the beast and false prophet casting them into the lake of fire then destroys all who have wondered after the beast and false prophet and have taken its mark. Then Satan will be bound for a time as Christ sends His angels out to the four corners of the earth as we who are of Christ own are then gathered up to Christ as we meet Him in the air and ever be with the Lord, 1 Corinthians 15:51-55; 1 Thessalonians 4:13-18.
The beast and false prophet and all the ungodly political leaders from every nation that follows after them will be destroyed by Christ who does all of this from the air, Rev 19:11-21. When Satan is loosed he will gather all those who oppose Christ to compass the camp of the saints that are gathered in the air being the breadth of the earth in measurement as we are not on this present earth after being caught up to Jesus in the air, but they are consumed by fire (whether it is literal fire or just symbolic of God's wrath against them yet they are destroyed) that God sends down to destroy them and Satan is cast into the lake of fire.
Between the binding of Satan and being loosed scripture says 1000 years, but many parts of Revelation are symbolic in what John was shown in His visions as I see 1000 years only being a figurative numbering as I can't see God waiting a literal 1000 years before casting Satan into the lake of fire and then comes His final judgment and the new Jerusalem being ushered down from heaven after this present earth and heaven are restored back to what God created in the beginning.
what is the second comming?
On the last day when Christ returns after the seven trumpets have sounded.
Mat 24:29 Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:
Mat 24:30 And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
Mat 24:31 And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
The Rapture is the catching up of the saints to Christ when He returns for His Bride being those who are in Christ and He in them through the Spiritual rebirth from above, John 3:5-7.
1Cor 15:50 Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.
1Cor 15:51 Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed,
1Cor 15:52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
1Cor 15:53 For this corruptible must put on incorruption, and this mortal must put on immortality.
1Cor 15:54 So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory.
1Cor 15:55 O death, where is thy sting? O grave, where is thy victory?
1Cor 15:56 The sting of death is sin; and the strength of sin is the law.
1. Second coming of Christ and the Rapture happens at the same time
2. then comes the millennium