Add a Visible Timer to Meetings

It would be nice to give speakers/presenters a visual queue on how much time they have left. People often present for longer than their allotted time because they are unaware of how much time they have used. Maybe have it hover over a shared screen or permanently in the corner of the window? Something like this: https://www.timetimer.com/collections/applications/products/time-timer-desktop-application-mac-and-windows_2