I've had a work permit for over 20 years, and on account of work, I've left Thailand consistently within the 90-day reporting time ever since. I was last stamped in on Feb. 22, and won't be leaving the country again 'til I can get back in without the need for a 14-day quarantine. Do I need to file a 90-day report before Sept. 26th, as I've never even done one before? FYI, work permit good through Jan. '22.

You report needs to be done by the 26th or a few days after (7 days allowed for a late report).