I went back and watched the 8th inning Kwan catch replay review, listening to both the DET and CLE radio feeds. Interestingly, both Dan and Bobby were convinced it was a catch, and the Cleveland broadcast was convinced it was a trap.
It won't last that long. Probably about an hour once it arrives until the last drops fall. By that timeline, if they haven't finished already, it would be game on by around 5. It would be a matter of how much rain falls before they get the tarp on.
The rule in 2023 is 4.03(c)4.
https://img.mlbstatic.com/mlb-images/image/upload/mlb/wqn5ah4c3qtivwx3jatm.pdf
There is no provision made for a change of score later in the game, so presumably if the lead margin narrowed, you'd have to go back to the bullpen for the next inning.