I am under the belief that Mass is over and you can leave only after the Celebrant says, “The Mass is over, go in Peace” . Plus just being polite and waiting until the priest enters the Sacristy.
b. The priest’s greeting and blessing, which on certain days and occasions is enriched and expressed in the prayer over the People or another more solemn formula;
DISCLAIMER: Catholic Answers has turned over the archive to Catholic-Questions.org and no longer owns, manages, or moderates the forums. For additional apologetics resources please visit www.catholic.com.