Holmes played basketball for University Liggett School in Grosse Pointe Woods, Michigan before transferring to Romulus Senior High School in Romulus, Michigan for his junior season.

[2] Holmes earned Second Team All-North Texas Junior College Athletic Conference honors.

[4] On January 6, 2021, he recorded a career-high 38 points and 10 rebounds, shooting 8-of-12 from three-point range, in an 83–57 win against Saint Joseph's.

[5] As a junior, Holmes averaged 13.8 points, 5.3 rebounds and two assists per game, and was named to the Second Team All-Atlantic 10.

[7] He was named All-Big 12 Honorable Mention, and garnered a spot on the Big 12 All-Newcomer Team.