"I don't know how close I am, I've only thrown twice and jogged a few times," Kelly said Friday. "Nothing even strenuous or anything, so I don't know a timetable for when a rehab assignment would be."
Kelly has thrown only twice off a mound, between 20 and 25 pitches -- all fastballs -- and said the muscles around the area in his hamstring feel strong.
Cardinals general manager John Mozeliak said Kelly should return by July at the latest.
Alex Halsted is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.