Baker, who underwent the season-ending operation on April 17, said he's throwing from 120 feet and hopes to progress to 150 feet soon. The right-hander added that once he gets to 180 feet, he'll likely shut it down for about a month before progressing to the mound.
Baker said the ultimate goal is to head into Spring Training fully healthy, but it's too early to guarantee that will be the case.
"That's the plan as of right now," Baker said. "That's the best-case scenario for sure. I think to use the Spring Training starts as the progression as the rehab starts, it couldn't have been a better Spring Training for that to happen. We have a couple extra weeks of Spring Training. So I'm not going to sit here and promise anybody it's going to work out that way, but that's what I'm shooting for. I definitely think that's an attainable goal of mine."
Baker is likely to be a free agent -- the Twins hold a $9.25 million option for next season they are almost certain to decline -- but said he hasn't ruled out re-signing with Minnesota.
"I'd like to be back," Baker said. "I know there's other great organizations out there, but this is all I know. I've been here and I've enjoyed my time here, my family likes it here. There haven't been any talks yet, but I've let them know that I'm definitely open to hearing what they have to say. Whether they choose to pick up the option or not, that's up to them. It's something that I'd definitely be interested in at least listening to what they have to say, for sure."