SUCCESS!!
But there was a slight hiccup.
After it completed 1st page of update (Download)
It went to a second page to proceed with update, where it gave me an error message. After error, screen refreshed and I got "Maintenance Mode" screen. It said that the screen will refresh by itself once maintenance is complete, but it was sitting there for over an hour.
So I went to command and issued:
signal-event nextcloud-update
After that, it was back to normal