emailing supervisor to ask about application status
It doesn't seem effective to ask the admissions office again if they have already said that you will hear only when decisions have been made.
But you could give the potential advisor an update that you haven't heard anything yet, asking if he has. But it seems unlikely that one of you would be notified and the other not.
Unless you have some actual reason for needing to know, such as replying about another opportunity, I'd suggest patience. You don't speed anything up by sending pointless emails.