I’m not sure what you mean. If you mean, are priests celebrating Mass in heaven, the answer is no. In heaven we don’t need Christ to be re-presented to us in the Eucharist because in heaven all souls are already seeing God “face to face”, enjoying the Beautific Vision.
I did find
this interesting article about priests, which said this about priests and heaven:
“Heaven discloses in a vision the graces that a priest mediates on earth: the truth he preaches, the transformation he enables, the lives he changes. Heaven reveals what, behind signs, the sacraments conceal. Heaven rewards in the sweet hereafter those who, impelled by divine movements, love gracefully here below. Heaven promises a love that never ends. Heaven means seeing God “face to face” (see 1Cor 13:12). Only the Catholic priest readies us for this kind of heaven, this heaven which the loving vision of God creates. Why? Without the Catholic priest, no transformations divinize, no sacraments effect what they signify, no saving premotions reach their term, no human love survives the grave, and, as far as we know, no one sees God “face to face.” Small wonder Saint John Marie Vianney proclaims that only from the vantage point of heaven do the blessed discover what a priest is.”
Remember, a baptized soul is still baptized in heaven, a confirmed soul is still confirmed in heaven, and a soul that received Holy Orders is still so marked in heaven.