I never received the OTAs, so I downloaded the Nexus 5&10 OTAs from XDA and flashed them via TWRP.
Before reboot, I flashed the SuperSU ZIP via TWRP as well. Both completed OK and I was updated. I did take a Titanium backup before I started and copied it to my PC in case the update failed, in which case it would have been a wipe, root and restore.
I'm still trying to find the OTA for my Nexus 7 2012 wifi.
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