[4] In his senior season, Jeffries averaged 23.3 points, 12.8 rebounds, 5.6 assists and 2.6 blocks per game, leading Olive Branch to a Class 5A state runner-up finish while being named Mississippi Gatorade Player of the Year.

[2] On March 12, 2018, Jeffries committed to play college basketball for Kentucky over offers from Alabama and Mississippi State, among others.

[5] Sources: Jeffries debuted for Memphis on November 5, 2019, recording five points, four rebounds, four assists and four blocks in a 97–64 win over South Carolina State.

[11] On January 20, 2020, he was named American Athletic Conference (AAC) Freshman of the Week, four days after scoring 18 points in a 60–49 win over Cincinnati.

[12] At practice on January 30, Jeffries partially tore his posterior cruciate ligament in his left knee and was expected to miss four to six weeks of action.