The assigned task of a high priest is to offer both gifts and sacrifices, and it's no different with the priesthood of Jesus.
If he were limited to earth, he wouldn't even be a priest. We wouldn't need him since there are plenty of priests who offer the gifts designated in the law.
These priests provide only a hint of what goes on in the true sanctuary of heaven, which Moses caught a glimpse of as he was about to set up the tent-shrine. It was then that God said, "Be careful to do it exactly as you saw it on the Mountain."