According to the Financial Times, it is not the independent panel that will decide their punishment. Instead, that will be another separate process and both the club and the Premier League will have the right to appeal - meaning this could all be dragged out for a very, very long time yet.
City are anticipating a verdict in the case in the next two months. They are clearly hopeful that they will be exonerated and that that will be the end of the matter, in what has already been a very difficult season on the pitch. If the club is found guilty of any of the charges, then it could be some time until we learn how they will be punished.