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https://getbootstrap.com/docs/4.0/components/progress/
But it requires changes to the theme HTML to add the correct .progress-bar classes, as well as updating the JS to match, i.e.:
https://github.com/jhenry/cc-bootstrap/blob/fbf604694077087b6822d4f6901a7509bfb516b8/js/fileupload.js#L135
Btw love the theme hope it will be done soon.