Our district is quite similar. Students are an A/B hybrid. A - in school Monday/Tuesday, B - in school Wednesday/Thursday, all virtual on Friday. When they aren't onsite, they need assignments to do remotely. I just figure I'm planning two tracks for on site and off site. This will be a crazy ride.
I don't have anything specific planned, but considering some home projects & worksheet type things that they can do remotely... and doing any other work that is best for in-person while they are on-site.(Students also have an option of remote learning only --- those won't have elective options in most cases.)