When you got your current decision. If your acceptance of an offer really is hinging on another program rejecting you then contact them for an update (could say something like: I have been accepted to a program but before making final decisions I would like to hear from X University. Do you have a timeline on when I will be notified of the admission decision?).
If an acceptance from another school won't change your mind on committing to a current acceptance though, probably not worth spending time on schools taking too long to notify you.
ShakesRos got a reaction from anxiousphd in 2017 Acceptances
ShakesRos got a reaction from allywally in 2017 Acceptances