When upgrading to 8.4.9, I noticed that the ETA (estimated completion time) of the work unit had disappeared from the web GUI.
The way to solve this is to click on Accounts Settings (the person icon on the top right), Appearance, and then move the ETA column to the visible columns, then click Save.
After:
I like this feature but it was a bit confusing at first. ETA should maybe be part of the standard columns - for us who use the machine to play games, it helps schedule gaming sessions.