I do have a similar issue here as well I can say...
I am updating windows from the release channel to canary and I had 2 bounce when downloading it from WU. Nothing too bad but once it went offline... it did a coupe restarts, got "stuck" at 60% for maybe 20 mins and now is at 64% for about one hour. Plenty of space on SSD as well before the whole process started as well.
Now I am gonna wait and see in the next... idk 2 hours maybe if there is gonna be a change or not...
As Pauli said, just wait, watch a movie, or take a very long walk