Thanks a lot for this. I can validate from my own experience this week - flew LHR to EWR on Monday, arriving after midnight UK time. TPs were credited on Weds though I was still showing as silver. Refreshed the app this morning (Thursday) to find it had turned a nice shade of gold, and I was able to immediately see additional gold availability in economy when searching for avios flights. Living the dream!
Thanks all on the board for the help - a particularly lucrative TP run on MH helped push me over the top.