I've done something similar with a progress bar back in the early days. The task needed to do 10 things, so when each one completed the bar would move 10%. So the bar indicated completion in terms of things that needed to be done but not really in terms of time. It was quick and dirty and we had higher priorities but someone insisted on a "progress bar" so that was the easiest thing.

That’s perfectly acceptable, in particular if you also display “step x of 10”, so the user knows the bar doesn’t indicate time.