There was some federation issues that are getting fixed plus a couple other bugs that need to get fixed before we update so site behavior doesnt break (e.g. show read posts not working). I assume we would update sometime after Christmas since 0.19.1 is in release clients and so we aren't dealing with maintenance over the holidays
Edit: seems like 0.19.1 released today, still likely after Christmas due to the second reason and so that can be checked to make sure there's no issues still
Thank you for taking your time to make sure 0.19 is stable before upgrading! I recently switched here from another instance because they upgraded while 0.19 was unstable and it broke a lot of things.