And, in the current situation in particular, I'm seeing a lot of groups adopting "no meeting Fridays." Though my experience is that many people sort of hesitate to schedule Friday afternoon meetings in any case. So, yeah, as you say Fridays tend to turn mostly into a clean up any little tasks for this week, come up with a plan for next week, and call it a day. If I'm honest, this tends to describe what I do a lot of the time.