BALTIMORE -- Red Sox right-handed reliever Tyler Thornburg, who has missed the entire season so far with a shoulder impingement, is throwing at a distance of 90 feet.

He initiated a throwing program April 12 but he never got beyond the long toss phase. Some symptoms returned, limiting him to work in the training room.

He just began throwing again this week.

"What that next step is, we've had multiple attempts to get through that, to get to desired distance of long toss, but he's at the 90-feet mark right now," Red Sox manager John Farrell said.

The Red Sox want Thornburg to throw long toss at 150 feet before his first bullpen session. He was beyond 120 feet "at times" earlier in his rehab.

SMITH STILL ON SCHEDULE FOR TUESDAY

Right-handed reliever Carson Smith, who underwent Tommy John surgery last May 24, still is on schedule to throw live batting practice Tuesday when the Red Sox arrive at Yankee Stadium.

This will be the first time he has faced live hitters since before undergoing his surgery.