“a harvest of judgment.” Like Israel, Judah has sinned, so Judah too will reap what she has sown. The NET nuances the verse for clarity, and reads, “I have appointed a time to reap judgment for you also, O Judah!”
“When I restore the fortunes of my people,” It is unfortunate that the chapter ends here, in the middle of a sentence. To get the whole thought, the reader must continue into Hosea 7:1.