For most practices it's less than 2 or 3 months contact-to-hire in terms of time, so even if you "don't match" you'll be fine since the latest match is in October. That puts you at the latest getting hired at Christmas which is plenty of time to get everything in.
Credentialing new grads is a breeze - you have very limited and typically uninterrupted work history and you have plenty of people willing to fill out hospital evals for you. There are some shops out there it takes a while, maybe 4 months (my fellowship shop was one of them... yikes they were bad), but you shouldn't have any issues with 6-7 months leeway. Of course if you have some oddball history with disciplinary action reported to the medical board, lawsuits, several different residencies, lack of board eligibility than it could become tricky. We don't start credentialing new hires until 3 months prior to their start date, but we also have tons of people on those committees so we can push through nearly anyone with a state license that isn't a total douche.
The bigger question is what is your backup plan if you don't match - go into practice and don't look back? That's fine, but if you think you want to try again in a year or two then you should tailor or applications appropriately.