I was surprised at church to see a Confirmation - being done by the Parish Priest.
I was told a priest can do it if the Bishop says so.
....And often when it comes to RCIA, at the Easter vigil, when it is a new Catholic who receives all 3 sacraments of initation, baptism, confirmation, and eucharist. Then the priest is allowed to confirm the new Catholic then.
When it is canidiates, those who were either baptized in other churches or Catholics finishing up their initation sacraments, then a priest has to get the bishop/archbishop’s permision, because the practice is to send the new Catholics over to the cathedral for confirmation of adults.