Peter does not answer that question in this passage, though he himself had proclaimed on the day of Pentecost that Jesus has ascended to heaven to be made Lord of all (Acts 2:33, Acts 2:36). Of interest to our present passage is the implication that the chief Shepherd is (physically) absent from his sheep and for the duration of his absence entrusted them to the care of (under) shepherds. Obviously these (under) shepherds will need to report to the chief Shepherd what they have done with his flock (Matthew 25:14–30).
4 And when the chief Shepherd appears, you will receive the unfading crown of glory.