Unfortunately it is a pain-staking long process with little information sent your way. I'm still in the PEB process (136 days as of today). I would guess that, if found unfit, you will be notified on or around April 10th.
DTM-18-004 dtd 30 Jul 2018 - Complete PEB process in no more than 102 days starting on the date the MEB forwards the complete MEB case file and ending on the date the Military Department approves the final results of the disposition decision.
I'm on day 124.
Called the PEB. They told me they no longer release information (which I knew - tried for fun). I asked how long after they get the proposed ratings will I be notified. 2-3 Months. Yep. Months.
As I understand it, if you are retiring, they will factor in both PTAD and terminal leave. I'm sure that you still have to submit for both in MOL since you have the option of 1: not taking it and 2: selling back leave.
You know what's crazy, the VA says they send a letter and the information will be available on eBenefits but neither seems to be true. I called a friend who works in the VA and they were able to tell me my proposed ratings so its in the system. Somewhere.
The timelines they initially tell you are garbage. My package was accepted by the PEB on August 2nd and I'm still not done (though I am past the VA portion).