Guys, medical training or not, we can't know enough to make any realistic determination neither from a few random articles nor from posts by the athlete himself.
All I know is it's a badly torn ACL + MCL + impacted recovery because of severe nerve damage, the guy's drills look very limited, and whatever his recovery time the guy is still a rookie.
Myles Jack, who was seen as a comparable talent to Smith dropped this stat line in his rookie year:
24 combined tackles, .5 sacks, 2 passes defended, and one stuff in 16 games.
Expecting a pro-bowl year in 2017 doesn't make sense.