Thank you, David, for providing instructions.
I will add some particulars of my experience installing the OTA that showed up a couple days ago on my rooted phone.
I uninstalled magisk using magisk manager. I clicked "uninstall" on the bottom and then "restore images." I think it's probably important to choose "restore images" rather than "complete uninstall." It said "restore complete."
Then I downloaded the OTA. The second screen "Installing.." said 100% with no status bar. There was never a dialog to reboot. Finally after waiting several I hours, started poking around to see wh