Well, I wouldn't say he's already on one, but through his first 40 games, he was hitting .159/.248/.234/.482 (!!!), with 1 hr (1 homer every 121 PA) and 6 rbi.
Since then, in his last 14 games, he's hitting .310/.362/.71/.933, with 3 homers (1 homer every 15.7 PA) and 9 rbi.
So not nuclear, but certainly.... a hell of a lot better. The Sox are 11-3 in those 14 games, by the way. Him swinging a hot bat REALLY changes the lineup for them, because when he's on, he's basically hitting at an MVP level, but in the bottom of the lineup. Gives the opposing pitchers no breaks at all.