The top five hitters in the Baseball Musings Batter Rankings at the end of regular season remain Christian Yelich, Anthony Rendon, Justin Turner, Alex Bregman, and Mike Trout. Three of those will continue to be rated based on their post-season games, and I suspect Mookie Betts will move into the top five by end of the World Series.
This is just after a quick scan, so I could be missing somebody, but it looks like Jacob deGrom was also the best-hitting pitcher this season.