Coverage will depend on how much nature provides. Last year I believe there was about a foot from mother nature on opening weekend. I believe they blow snow for a couple weeks before opening around the main lodge for sure & maybe the mill? So what's typically open will be a lot of the runs the funnel into main lodge (main & forest park should have a couple features), sometimes chair 3 is the highest that will be open. If there's some good help from natural snow, Cornice Bowl could be open. If you or any pals are beginner riders, they usually don't have beginner runs open until Thanksgiving weekend - Discovery Chair out of Main. Eagle and Canyon won't open til Thanksgiving at the very earliest, usually they open mid Dec.
I know it's iffy to pull the trigger on place to stay, driving up, etc. without knowing what'll be open, but if you're jonesing for some riding there should be plenty of fun to be had (with a lot of other people). I seem to remember that even waiting for the weekend or 2 after opening weekend, it being less crowded, and there may be more open.