It would be nice if Mastodon let me publish toot(s) on scheduled time just like what I can do on TweetDeck. It is handy for cases like publishing a toot to celebrate someone's birthday at 00:00:00 of that day (it may sound silly but many anime fans do that to celebrate birthdays of their favourite anime characters).
@0xA718 that's something for the client to implement not Mastodon. I'm sure at some point a client will have this feature if it doesn't exist already.