Should I send a follow up mail to my potential supervisor
You are panicking indeed. Give it some more time.
This was last Friday, and I assume your response was also on Friday. However, that was only two working days ago, and this supervisor is probably now in the progress of furthering the application. This probably means filling in some form, possibly requesting availability from potential relevant others that should be involved in the process, HR/administrative tasks, there's lots of reasons why they didn't respond yet.
The fact that they reviewed you application positively should give you enough ease to just wait it out a few more days (weeks maybe even). If you haven't heard anything back in a weeks time you could consider following up and indeed asking what the next steps are. But for now, be patient and be happy that they want to continue with you.