You can get a rough estimate using online wRVU tables and knowing what fraction of the patients will be new vs follow ups. I also suspect that "he" is not getting paid for every single RVU he generates, rather a bonus after a certain baseline (used to pay that $300).
I have a similar setup in my clinic and pay structure. I usually see 2-3 new consults a day (almost universally 99205) and 12-15 follow ups which are usually about 40% 99213 and the rest split between 99214 and 99215.