Last I spoke to PEB, I was told its a 17 day wait between being found unfit and being sent electronically to the VA. Most likely I'm guessing its a mix of medical documentation, admin documentation, scanning etc... and just slow clerks using government computers and scanners, who then have to send it to the VA. All the while there is a back up. I spoke to them in mid SEPT 2019.
Once it gets sent, it goes to DRAS, its a department within VA who takes the medical information and the VA forms you filled out and produce ratings.
VA then send those ratings back to the PEB, who then makes DOD ratings.
PEB then sends it to the PEBLO. Peblo is in the dark until then, and i'm pretty sure will not reach out on their own to get you information.
DTM-18-004 July 30, 2018 is the IDES timeline goals, and explains the whole process without confusion.