The Zoom client has already a built in calendar integration. Once connected, it will show you all upcoming meetings for the day including a button to join the call. It's quite convenient.
As someone who has to have zoom, teams, and webex meetings with clients I would enjoy a tray item that would just organize all those into a lista and have one click access the task tray, integration with various calendars (mainly icloud and google) would be even nicer. Even if it just summed up my week. Extra points for cross platform. seems as if someone probably hasn't already built in emacs probably :)