Kelly was assigned to the High-ALake County Captains for the 2021 season.[10] In 40 appearances for Lake County, he posted a 5–5 record and 4.66 ERA with 81 strikeouts and 7 saves in 56.0 innings pitched. He began the 2022 season with the Double-AAkron RubberDucks.[11] In 48 appearances split between Akron and the Triple-A Columbus Clippers, Kelly pitched to a combined 5–2 record and 2.04 ERA with 75 strikeouts and 4 saves in 57.1 innings of work.
Tampa Bay Rays
On December 7, 2022, Kelly was selected by the Colorado Rockies in the Rule 5 draft and added to their 40-man roster. The same day, he was traded to the Tampa Bay Rays in exchange for cash considerations.[12] On March 27, 2023, the Rays announced that Kelly had made the Opening Day roster.[13] On April 28, Kelly recorded the final out in a 3–2 victory over the Chicago White Sox to earn his first career save.[14] In 57 appearances out of the bullpen in his rookie campaign, he logged a 3.09 ERA with 56 strikeouts across 67 innings pitched.
Kelly was optioned to the Triple–A Durham Bulls to begin the 2024 season.[15]
Personal life
In January 2023, Kelly announced his engagement via his Instagram account[16] to his longtime girlfriend Dr. Sarah Hosseinian. The two of them married in Leesburg, Virginia on January 13, 2024.