Week progress as a single live percentage, with the seven days marked off as they pass. It is a blunter instrument than a to-do list and occasionally a more honest one: at Wednesday lunchtime you are not halfway through the week, you are past it.
Elapsed time versus working time
The bar measures elapsed calendar time, so by Friday evening it reads about 71% while your working week is finished. If you track effort rather than hours, midweek is the natural checkpoint — the reasoning is in Wednesday productivity and the weekly review ritual.