Most installers have a single progress bar that shows the overall progress, and then text which explains which component is being installed right now.

Update:

After discussion on backlog grooming session it seems reasonable to have two progress bars instead of one. Considering size of downloaded resources and time spend for downloading/installation we might have much longer installation time than now with single progress bar. Instead we can start downloading resources and install them as soon as download is finished. That would let us run installation in sequence and avoid problems with running two MSI installer at the same timed. Also that would save some time and do installation for smaller components while download for big ones is in progress.