Chaff is the husk of a harvest being cleared — not a label for every unbeliever until the end of matter.
Threshing floors in the prophets are judgment scenes. John says the Coming One already has the fork in His hand — present tense.
Matthew 3’s wheat and chaff prepares Matthew 13’s wheat and weeds. Both are about a field God is finishing in that age.
The remnant gathered into the barn is the New Covenant people. The chaff of the old administration is cleared when that world ends.
You are not living in the winnowing. You are living as wheat already stored in the King’s house.