Why would it be "great", and why is this info valuable to you when you already have ETA and queue size to judge when the queue will be done, for instance? I'm asking this out of genuine curiosity, as the status bar is already quite full of stuff, and nobody has asked for this before.
Personally I'd much rather see something like this as part of a more fully developed dl history & stats function (on a new tab, preferrably) as others have requested.