I think it would be a nice qol improvement to see what a player is up to in game, perhaps while upon hovering on their name in your friends list. Just generic terms like In a Dungeon, or Out in the Overworld I think would be okay.
Sometimes I get messages from people whom I can’t answer to right away due to what I am doing at that moment, rather than ignoring them, they might get a forewarning as to why I might not answer?