No transfer credit at all.
As far as getting shit done...honestly, if a Master's degree makes or breaks your chances at promotion to Major...you're doing it wrong. If your leadership is racking and stacking Lts and even young Capts by whether they have an "advanced degree" from some shithole for profit online degree mill...they're doing it wrong.
That said, finding time to do the Master's degree is up to you. For me, I started it about the time my PRF was due. Is that the right time for you? Maybe. Is the right time for you right after you get to your new squadron and you're just out of IQT? Maybe...but probably not.
My current mentoring to new dudes I fly with is simple: 1) learn the jet now. 2) Do SOS once you're eligible, because then you don't have to worry about it...and if you don't get to go in residence for some reason...you're still promotable. 3) The Master's degree is up to you; but I recommend the ACSC OLMP because it is "free" (some courses have books that you have to buy/rent/borrow/etc), you don't have to deal with TA, you get "free" credit for 3 of 7 ACSC exams after you're a Maj(s), and you can complete it in just under two years...which means if you start it when you're eligible (Capt, 6 years TAFSC, and SOS complete) you'll finish it before your PRF is generated.