When this stupid plan was approved, the pilots (who are already trained as Ukraine Air Force jet pilots) were supposed to be trained and flying over Ukraine by now. That was somewhere past "ambitious schedule" and a lot closer to "full on lie".
Won't be until next year and they won't fly near the types of missions that would need to in order to make a difference.
Under optimal circumstances - with full and direct parts/logistics/support, you will never see more than HALF a squadron of foreign F-16s operational on a good day.
Ask anyone who's tried it.