When Jesus Christ reaps, after the tribulation when there are no longer any Believers alive on earth
(Matt 24:29), He is gathering all of the souls of all saints of all time who are not
already in the Temple of God "from the farthest end of the earth to the farthest end of heaven"
The apostle Paul, writing to the church of Corinth and Thessalonica, provides additional information of this reaping
but with a view towards Believers, and indicates that this is the start of the process of resurrection
(1 Cor 15:51-54; 1 Thess 4:16-18).
When Paul states, "the perishable must clothe itself with the imperishable," he is referring to the white robes of
righteousness that the martyrs received earlier (Rev 6:11), in preparation of the
Wedding Feast (Rev 19:7-8), which determines who is imperishable.
When the angel reaps, the "grapes" are tossed into the great wine press of the wrath of God (Rev 19:17-20),
and it is Jesus Christ, when He arrives at Armageddon, who treads on the "grapes" in this wine press
(Rev 19:15). Taken into consideration, this reaping includes the dispensation of the
bowl judgments and the battle of Armageddon.
For deeper study:
What and When is the Tribulation?