There's still progress bar on update and there's timer (but not always).
The timer also jumps. Once I had ~40 minutes update that was hope-feeding me with "2 minutes left" for most of the time.
My guess is that it's not worth optimizing, but nowadays I shy from updates if I don't have 2h of time buffer (not because I am afraid something will break, but because I know I'll be locked out).
Their update timer always start from 29 minutes remaining and goes from there, IIRC, and I find that it's way more accurate than Windows' one on 99% of the time.
Funnily, Linux (KDE) got very good at their estimations for some time now. Better behaving storage also has a role, I presume.
The timer also jumps. Once I had ~40 minutes update that was hope-feeding me with "2 minutes left" for most of the time.
My guess is that it's not worth optimizing, but nowadays I shy from updates if I don't have 2h of time buffer (not because I am afraid something will break, but because I know I'll be locked out).