YSK: Mastodon bots work here too— there IS a remindme bot already!
Why YSK: I've seen several commenters asking if there were specific bots such as RemindMe
However, there are so many bots already on mastodon that will federate with us! Check out botsin.space, a masto-instance specifically made for hosting bots
Just tag @remindme@mstdn.social and say the time after (I recommend you not do it on this post unless you have an actual reason though as it could spam their servers)