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ok the solution is to leave the computer - for 40 hours! Mine finally had a login screen this morning. ridiculous, but at least it's not bricked and I can get more work done today.
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some people on Macrumors forums have just left them and they finished eventually. i was right where you were and then reset my PRAM and it then got to a new screen with an image of Catalina Island and progress bar saying 26 minutes remaining. It didn't progress, so I hit the power button and it said "1 minute remaining" and then shot back up to "9 minutes remaining". I restarted about 5 hours ago and left it, and it's been at "16 minutes remianing" since. FML
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OK well this is somewhat encouraging - same machine here, but been about 18 hours for me now (with several reboots and PRAM resets along the way). Now sitting at Catalina Island screen, which was not the case until I reset PRAM that first time.
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mine has still not completed, and has been going on for close to 18 hours now. i have a late-2016 MBPro 15" (so no T2 chip). have NEVER had a problem running or upgrading betas before, so this is very very strange. i have tried restarting it, and it kept getting stuck around 30%. hitting the power button would bring up text about the computer automatically restarting during the installation process, then showing 9 minutes to go, then saying calculating... I forced another reboot and reset PRAM and then it booted up to the Catalina island picture (instead of Apple logo), so I thought that was progress. It says 26 minutes to go, and that was about 12 hours ago. I did another PRAM reboot just now and it's still stuck on the same screen.
