300 home runs
McCutchen likely would have hit his 300th home run last season had it not been for both an elbow injury that significantly bogged his power down in the second half of last season, and partially tearing his achilles in the first week of September. Cutch finished the 2023 season with 299 home runs. So long as McCutchen stays relatively healthy next season, he will reach this milestone, maybe even after the first week of the season.
Once McCutchen hits his 300th home run, he will join some pretty elite company. Only 14 players have ever hit 300+ homers while playing at least half of their games in center field. At least eight of those players will likely, or are currently enshrined in Cooperstown. Trout was the most recent center fielder to hit their 300th home run, which came in 2020.