You can use the vol move status command to display information about the volume that is moved.
system1> vol move status vol1 -v Source : vol1 Destination : aggr1:ndm_dstvol_1188375081 State : move Cutover Attempts : 3 Cutover Time : 60 Last Completed Transfer: Data Transferred = 324 KB Time Taken = 1 s Current Transfer Size = 0 KB