on macos I just add `; say done` to my command. If I didn't think of doing it before starting the command (which is most of the time), I just type it and press

on macos I just add `; say done` to my command. If I didn't think of doing it before starting the command (which is most of the time), I just type it and press enter while the command is runnign, it gets buffered and executed right after the command finishes (be careful that it's not an interactive program that you're executing though, or it might take your "say done" as an interactive entry)