Why can’t pre, mid and post trib gatherings all be correct? Literal harvests are done in three stages.
Sometimes there are many many harvests because some things are ready to be picked one month, but more the next etc so those just can't be used as examples.
The bible says the rapture or harvest of the saints happens all at the same time and both Paul and Christ placed it after the Great Tribulation has ended. I can show the scriptures for that if needed.
The only other harvest (in Revelation 14) is of the unsaved and they receive punishment.
There is no 3rd harvest of people.
Rev 14:14 And I looked, and behold a white cloud, and upon the cloud one sat like unto the Son of man, having on his head a golden crown, and in his hand a sharp sickle.
Rev 14:15 And another angel came out of the temple, crying with a loud voice to him that sat on the cloud, Thrust in thy sickle, and reap: for the time is come for thee to reap; for the harvest of the earth is ripe.
Rev 14:16 And he that sat on the cloud thrust in his sickle on the earth; and the earth was reaped.
First harvest (the rapture)
Rev 14:17 And another angel came out of the temple which is in heaven, he also having a sharp sickle.
Rev 14:18 And another angel came out from the altar, which had power over fire; and cried with a loud cry to him that had the sharp sickle, saying, Thrust in thy sharp sickle, and gather the clusters of the vine of the earth; for her grapes are fully ripe.
Rev 14:19 And the angel thrust in his sickle into the earth, and gathered the vine of the earth, and cast it into the great winepress of the wrath of God.
Rev 14:20 And the winepress was trodden without the city, and blood came out of the winepress, even unto the horse bridles, by the space of a thousand and six hundred furlongs.
Second harvest.