Just updated to Mojave with the same non-progressing bar with 3.0.2 after waiting over a hour.
Restored back to 3.0.0 and yes, progress bar did not move, but it finished downloading data quickly.
Then updated to 3.0.2 from within program. Seems to be running ok now, but of course there is no back data at this point.
If it happens again, I will try and capture a log file of the crash and go back to 3.0.1
Before updating I had NO problems with 3.0.2. *sighs*
PS. Also Fusion Drive in my bigMac
i had some comm problems, *have no idea WHY* and 3.0.2 started playing up again; so i reverted back to 3.0.1.
Things seem to be ok ....but am remaining on 3.0.1 for the forseeable future.