Knotts is nearing the NY/CT border and is trying to make Salisbury before the PO closes (presumably Friday but thy are open Sat).
This will be 35 days, or 42.8 mi/day. Assuming 40 mi/day to Katahdin, for 690 mi that will be 17.2 more days or 52 + days total.

He is having typical feet problems and the hardest terrain ahead, so it's too early to predict accurately, but clearly he is a serious contender.

Knotts had a few goals this year. He started out hiking on the CDT and PCT with the idea of going back and hiking a calendar year triple crown. He also planned to go out a fast as possible and challenge the overall (supported) FKT, which is clearly out of the picture. He has always given priority to the unsupported fkt. I don't think the other goals will distract him, but a poorly planned resupply could be blamed on too much going on.