If Dining has their act together and they continue with this policy, then yes, you should be able to make your PS that early. In 2002, I called on the first day and then was transferred to dining and the CM I got wasn't quite up on the process and it took a while.
However, don't count on it as set in stone just because it has happened the past 2 years. You never know when changes happen or policies change. I am not trying to be a doomsdayer, just being cautious, because I am not an insider.
Just if the policy stays the same, you should be able to make PS that early.