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After the reboot, I somehow managed to restart the update. It left off from 60% and was completed sometime later with no notification to my phone. The car's software version had been updated to 2020.4.1, so I cancelled the service appointment.
After rebooting, the app notified that a software update was available. However, the subsequent attempt to update the car failed. Vehicle stated that it required a software update and to schedule a service appointment which I did.
Same here. Mine is stuck at 60% (in the app) with screen showing "Software updating to 2020.4.1, Updating Electronic Control Units" for about 15 hours.