Hello. This is a very simple feature I've seen in another CAT tool and I found it to be very motivating and generally giving you a better overview of the workload. It also has an estimate of the time needed to complete the task:

The speed is of course a rough estimate and depends on how quickly you confirm a segment, so I believe this would be something very simple to implement. So simple in fact that I'm surprised it has not been implemented yet.
 
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