It's always an interesting read on the most talked about nerve in sports. As of April 2016, it was reported he had enough time to regrow 2 of the 6 inches needed for the nerve to fully heal. After that it seems to stall with no significant progress until this week. At 80% that leaves him with 1.2 inches to full regeneration, which we'll then have to see if he's truly 100 percent and pain free. It's hard to pinpoint exactly how much time that will take to occur, but if you average out the time from last April it could take about 6 months. Or if the nerve really just started making progress recently and has grown say 2 inches since March 2017 you could be talking as little as a month and a half to full regeneration.
Hopefully it does end up fully healing, but I would not be surprised one bit if he starts the season on the pup. Not worth further injury to the knee or over compensating leading to another injury... If he does make a comeback and has a great career, it will be one hell of an accomplishment.