Don't bother wondering. Just order GCMS and wait. I know a friend who had ready to finalize in October, 2018. He called and they said he would get the PPR mail shortly. He didn't get the mail till Early March, 2019.
So it really baffles me what goes on at the various Visa Offices. The best we can do is ensure our applications are clean and accurate. RIght now i'm wondering how i let my wife get pregnant. heheheheh... else i should have received my PPR before now. We have to wait for baby to get MEP and the glorious Reviewing Officer to review our applications.
In God we trust!