He is fast fast fast (and he is always getting on base). The current record for all of pro baseball including minors and majors is 145 set by Vince Coleman in single A in 1983. Billy Hamilton (Cincinnati Reds prospect) is leading all of pro baseball with 104, and is on pace for 163 steals by season end.
He just led single-A Bakersfield to the first half title in the California League, and was promoted to AA Pensacola right before the Allstar break.
He was batting .323 with 1 homer and 30 RBIs before being promoted. 9 triples as well. 104 steals, caught 21 times.