Randy is not correct.
Nowhere in the Bible does it say anyone will become immortal before the GWT Judgment, AFTER the Millennium.
1Co 15:23 But every man in his own order: Christ the firstfruits; afterward they that are Christ's at his coming.
1Co 15:24 Then cometh the end, when he shall have delivered up the kingdom to God, even the Father; when he shall have put down all rule and all authority and power.
1Co 15:25 For he must reign, till he hath put all enemies under his feet.
1Co 15:26 The last enemy that shall be destroyed is death.
1Co 15:27 For he hath put all things under his feet. But when he saith all things are put under him, it is manifest that he is excepted, which did put all things under him.
1Co 15:28 And when all things shall be subdued unto him, then shall the Son also himself be subject unto him that put all things under him, that God may be all in all.
Mat 13:37 He answered and said unto them, He that soweth the good seed is the Son of man;
Mat 13:38 The field is the world; the good seed are the children of the kingdom; but the tares are the children of the wicked one;
Mat 13:39 The enemy that sowed them is the devil; the harvest is the end of the world; and the reapers are the angels.
Mat 13:40 As therefore the tares are gathered and burned in the fire; so shall it be in the end of this world.
I feel that revelation is all about those that lived under the law and not future. It ended when the temple was destroyed.
In all of the above there isn't a time mentioned. When Jesus comes there is no destruction of earth just taking the devil and his children and burn them. The harvest mentioned above.