UDFA, so there isn't much.
From Prospects1500:
"Signed for $50K as a undrafted free agent, Connor McCullough made history last week by throwing the first no-hitter in Kannapolis Cannon Ballers team history. His signing scout Torreon Woods shares, “He’s an even keeled guy, doesn’t get too high or too low on his accomplishments and failures and I believe that serves him well on the mound when facing a sense of adversity. He has a very competitive mindset with a will and drive to win. He’s the guy you want on the mound when you want to win a game.” So far, so good as McCullough has posted an ERA of 1.67 for the season. In 32 innings he’s allowed only 19 hits while striking out 39 and walking six."
From RotoBaller:
"Chicago White Sox minor-league pitcher Connor McCullough, 23, was signed as a non-drafted free agent out of Kansas State in 2022. A low-risk addition at the time, the right-hander has developed into a very promising arm within Chicago's system. Despite a limited sample size, one could argue that the White Sox found a true diamond in the rough. The 6-foot-1, 185-pound hurler has a standard four-pitch mix with a fastball, curveball, slider, and changeup. The fastball and curveball appear to be his best two offerings; they complement each other nicely and both have proven to be effective at striking batters out. He has also done a great job locating the strike zone, minimizing walks and home runs and inducing plenty of weak contact. This past week, McCullough delivered an impressive seven-inning no-hitter. He allowed just one walk and struck out eight batters along the way. Furthermore, he has not allowed a single run through three starts in the month of May. Keep an eye on McCullough, because it appears the White Sox might have uncovered a rising star."