"He's doing all the things that he can possibly do outside of the thumb," manager Matt Williams said.
Williams said it is still early in the rehab process and the injury is still healing. As a result, the manager is proceeding with caution and taking it slow in regards to the extent of Harper's activity.
"He's progressing," Williams said. "It takes a while to heal that, though. I think he's really right on track."
Daniel Popper is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.