There is a bar at the bottom left of the Kató TM which shows the word count and your progress with your task.
Also, each segment has a grey/blue/green stripe at it’s left, which signals it’s status. Grey means the segment has not been translated yet, blue that it has been translated, and green that it has been revised.
The translation is done once all segments are blue:
The revision is done once all the segments are green: