And the twenty-four elders, who were seated on their thrones before God, fell on their faces and worshiped God, 17 saying: “We give thanks to you, Lord God Almighty, the One who is and who was, because you have taken your great power and have begun to reign. 18 The nations were angry, and your wrath has come. The time has come for judging the dead, and for rewarding your servants the prophets and your people who revere your name, both great and small—and for destroying those who destroy the earth.”
The "time has come for judging the dead"? When does the judging of the dead happen? It is described here:
The dead are those left on the earth at the sound of the 7th Trumpet. They are those left after the final harvest. They are those left after the sheep and the goats. They are those left after the wheat and tares. They are those that will either take the mark or cut their heads off. Those dead will be destroyed who are still alive destroying the earth.
This is when Daniel 9:27 starts. Jesus will confirm the Atonement Covenant with those dead about to be judged. The rest of the living: the sheep, goats, wheat and tares were already judged. Now the rest of the dead will be destroyed. Unless in the midst of the week of the 7th Trumpet, there is a 42 month stay of execution. This 42 months is provided for those who will chop off their heads to avoid the mark. They are the ones compared to the rest of the dead in Revelation 20:4-6. If there are 42 months those dead will be killed at Armageddon, at least those who have not killed themselves or were beheaded. Those beheaded are resurrected prior to the thousand years. The rest of the dead killed after this point and by Armageddon, will remain dead until they are cast into the LOF after the thousand years. These dead should have been judged, but they are not, as there was a 42 month reprieve. But this judgment is now postponed because of the 42 months mentioned in Revelation 13. Now they are all dead, so the judgment is now after the thousand years for all the dead, and those still in sheol.
The judgment for those alive on earth at the Second Coming is the one found in Matthew 25:31. But that is not the same as the GWT after the 1,000 years. At the Second Coming those alive are judged, those in Adam's dead flesh, those dead. Not the physically dead people since before and from the Flood. Adam and his descendants died as the dead prior to the Flood, unless they were found righteous. We are only told that Enoch and Noah were righteous. As far as we know the dead included all of Adam's family except Enoch and Noah.
But all since Shem, Ham, and Japheth have been "the dead" who destroy the earth while physically alive. Then they are "the dead", physically dead, waiting in sheol. But whether alive or dead, physically, they are "the dead". Only those in Christ are "the living". The sheep are changed from death to life while still living never having physically died. They faced the judgment before Jesus as King. The same with the tares and the wheat. The wheat are those whom Jesus sowed as good seed. They are judged and changed before physical death. Some may call them the left behind after the Second Coming. But they are still the dead judged and changed by Jesus after the Second Coming.