Now while Jesus is a High Priest in heaven, John didn't see Him doing any High Priest work.

.....................While He was clothed in a High Priestly robe, there was no headdress on His head, nor Kingly crown.

.................................................This is evidence that John was transported into the "Day of the Lord", and that his vision of Christ is as He shall appear after His High Priestly work is finished and before He takes His Kingly Office.