Updating to 5.0 taking a long time / stuck

How long should update take? I’m at about an hour and it is showing 80% or so on the loading line. If it is stuck, how should I get out of this screen and fix?

Ok this eventually just stalled out. When I try to log in I get this… Unfortunately re-starting or shutting down does not help. Anyone have an idea or “how to” for a low to mid level tech guy to fix?