Dear Brother
Doulos Iesou, I can only give what I believe to be the order of the resurrections; the first and the second. All believers of all time are a part of the first resurrection that the second death has no power Mat 22:31 & Rev 20:6. Will those who believe that have died during the millennium be included as the elect of God? I think so.
We of the first resurrection will not precede them that whose bodies are asleep in Christ 1 Cor 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. Since there are many of the camp of the saints at the end of the millennium, the last trump by necessity must include them of Rev 20:9. Again, a last trump signifies previous trumps.
Now this last trump is talking of a time at the end of the thousand year reign when 1Cor 15:26 tells us that the last enemy
that shall be destroyed
is death. The entire church shall have been with Jesus for His reign over the earth. As to the order of their part in the resurrection,
I personally believe there will be ranks of the church as described by John all before the second half of the tribulation. The twenty-four elders of Rev 4:4, and Four living ones of 4:6, the great multitude of Rev 7:9, and last of the church is the Man child of Rev 12:5 shown in heaven in Rev 14:1.
My thoughts.