Peavy threw a side session Tuesday in preparation for his start against the Los Angeles Angels on Friday, which will be his first outing of any kind since he was injured last July. Coincidentally, he was facing the Angels in that game as well.
"I got tired toward the end, but I worked at a pretty good pace," Peavy said of his bullpen session. "Like I said, the first half was good. The second half, I got tired. That's because the intensity is starting to climb and you got to find out where you stand. It went well. No health problems, got a good workout in. Things are on schedule for Friday."
Peavy threw 40 pitches Tuesday, saying that probably the first 25 were at full strength before fatigue set in. He said he might be pushing it to go two innings Friday and certainly won't throw more than 40 pitches in the game.
"I don't know if I'll be going all out, but I'll certainly be trying to get guys out and won't be throwing cookies in there or throw like batting practice," he said. "It will just hopefully be a good step in the right direction, and I've got my fingers crossed and expect the best."
For now, he still thinks he can be ready to pitch for the White Sox on April 10 at home against the Tampa Bay Rays. That is the first time the fifth spot in the rotation will be needed.
"As of right now, we're on that schedule," Peavy said. "If we have any setbacks, it will be hard to get there. I'd love for that to happen. There's nothing etched in stone quite yet. We'll make sure we cross all our Ts and dot the Is before we make any hard line decisions."
As it is for pitchers as they recover from any surgery, arm strength is always the key.
"I think it's coming," Peavy said. "I think it's getting better and better. I think we'll know about halfway through spring training. You can tell when guys are swinging.
"As far as a radar gun, I can take it or not. You can watch a guy, some guys can throw 96 [mph] and guys are in there very comfortable, and some guys throw 90 and the ball gets on hitters. That's the way I do it. I'll tell if I have what I need to have to compete, which is by the way the batters react and how to keep them off-balance."
After the progress he has made in camp already, he is confident he will be able to compete when he faces the Angels.
"Today was another good step in the right direction, and I look forward to [making] a huge step," he said. "Sometimes throughout the winter and even last summer I wondered if it would happen again, and I'm excited that Friday is almost here."
Doug Padilla covers the White Sox for ESPNChicago.com and ESPN 1000.