Incorrect, the harvest was the end of the Jewish/Israel age.
John warned the tares:
(Mat 3:7 But when he saw many Pharisees and Sadducees coming to his baptism, he said to them, "You offspring of vipers! Who warned you to flee from the coming wrath? )
John said the axe was already laid at the root of the "trees" ready to be drawn back for the felling strike.
(Mat 3:10 Even now the ax is laid at the root of the trees, and every tree that does not produce good fruit will be cut down and thrown into the fire.)
Jesus stated the harvest was already ripe in his day:
(John 4:35 Say not ye, There are yet four months, and then cometh harvest? behold, I say unto you, Lift up your eyes, and look on the fields; for they are white already to harvest ).
There are no tares in Christ's kingdom, you are either born again or not, in or out.
There is no need to gather any unbelievers out of His kingdom.