In 2017 I thought Goff learned the system very well- a credit to him, McVay and LaFleur. But there were times he was a beat late getting the ball out. This year he improved on that quite a bit. But...there were still times when he was late. I think that's just natural progression. Continuity of both the system and his surrounding cast (all the skill players around him return) will help him continue to improve there. Part of why someone like Brady is rarely a beat late is he's been in the same system for 10+ years.
Keep the OL around him strong and I have no doubts the kid will keep on an upward tarjectory.