Comment by proberts

As long as your PD is current per the DFF chart in effect, then there's no date by which you must file your I-485. It's different if the Final Action chart were current. In that case, assuming it remained current, you would need to take I-485 or IV steps within one year. Of course, if you return to your current employer, it would need to be a bona fide job in the same/similar position.