As others have said, call at 90 days out from your hotel check-in date, 7am est time. I would recommend making Le Cellier your first ADR.
We were able to get an ADR at Le Cellier for the first time, but had to be flexible on the day. For the first several nights after we check-in, Le Cellier was not available. I forget the day, but I think we found availability on the fifth night of our stay.
NOTE: keep checking the boards! There have been whispers that Disney may be changing the new 90-day + 10 rule back to the 180 days policy.