Storyline course progression bar

Hi all - I'm looking for a way to implement a way for learners to see how far they've come, and how far they have yet to complete in a storyline course.

I have little space on each slide and I don't want the course progression to be too distracting for learners, so I was thinking of implementing something that could show in a layer or lightbox slide if learners click an icon on slide and want to check progress.

I'd be interested to hear thoughts on this, pros and cons, or examples if anyone's done something similar in the past. Thanks, community!