Kelly (undisclosed) threw a bullpen session Sunday but isn't likely to be ready by Opening Day, Juan Toribio of MLB.com reports.
Kelly continues to make progress toward a return, but he has yet to face live hitters and won't do so until tossing more bullpens. With Opening Day now 10 days away, it appears Kelly won't be able to ramp up in time to start the season on the active roster.