Double-header MNF with some overlap:
Patriots-Chiefs Time: When Teams Reportedly Will Kick Off Monday Night - NESN.com
As of now, the game is scheduled at 7 PM on CBS, with ESPN's MNF pushed back a little to an 8:50 kickoff time.
It absolutely will be shown locally - the only question is if CBS is allowed to show it nationally. It'll definitely do better than their current COVID schedule: one fresh hour of Big Brother, followed by two hours of new-to-broadcast shows (One Day at a Time x2, Manhunt: Deadly Games, all aired previously on other networks).
Given the choice, there's no way CBS doesn't shelve Monday's programming for MNF+ and move Big Brother to Tuesday, delaying the other two series for a week. The only question is how exclusive ESPN's MNF is. They'll no doubt be annoyed that their marquee game is being overshadowed - although no doubt it'll be a less competitive game without Cam.
More importantly: Someone tell me when my Jeopardy! airs.