Different schools may have different policies, but perhaps some students involved in admissions can weigh in on their specific schools' policies to give some kind of insight.
From my experience, I know that many schools vote on candidates and then give all decisions to the dean to sign, so he/she has the final call.
I think you're trying to determine how likely it is that you have been accepted, given that the dean needs to sign off on your app...but I don't know that you'll get much info like this. Usually each interview session or after a few interview sessions (once a month or once every two weeks, sometimes) the dean will review the decisions for all the candidates, then he/she'll release the decisions to the admissions office and students will be contacted about the decision. Even if rejections don't have to get signed off by the dean, the admissions office would likely still use this same statement to basically tell you that they're not at liberty to release the final decision yet.
Sorry and good luck with the decision!