After signing, White did not appear in an official game with a Rangers' affiliate in the 2018 season. Instead, he took part in a new program put in place by Texas for their newly drafted high school pitchers. The "de-load" program as the organization called it, emphasized building a foundation mentally and physically while resting the pitchers' bodies from a strenuous senior season and pre-draft showcase circuit. The players were put through a strength program and classroom work until the post-season fall instructional training started.[8] White suffered a torn
UCL and underwent
Tommy John surgery in May 2019, causing him to miss the entire season.[9][10] White did not play in 2020 due to the cancellation of the
Minor League Baseball season because of the
COVID-19 pandemic.[11]
White spent the 2021 season with the
Down East Wood Ducks of the
Low-A East. In his first professional game, White struck the ground with his right hand after making a fielding error and fractured his hand.[12][13] After making a rehab appearance with the
ACL Rangers of the
Rookie-levelArizona Complex League, he returned in August and finished the season posting a combined 4–1 record with a 3.06 ERA and 56 strikeouts over 35+1⁄3 innings.[14][15][16] Following the 2021 season, White played for the
Surprise Saguaros of the
Arizona Fall League.[17][18][19] White was named to the Fall League All-Star team.[20] White was named the AFL Pitcher of Year, after posting a 5–0 record with a 1.91 ERA and 29 strikeouts over 28+1⁄3 innings.[21][22]
White opened the 2022 season with the
Hickory Crawdads of the
High-ASouth Atlantic League.[23] After going 6–2 with a 3.99 ERA and 81 strikeouts over 58+2⁄3 innings for Hickory, White was promoted to the
Frisco RoughRiders of the
Double-ATexas League in June.[24] With Frisco he posted a 3–0 record with a 2.49 ERA and 23 strikeouts over 21+2⁄3 innings. White missed over two months with a right forearm strain, but returned in time to pitch in the Texas League playoffs.[25][26][27] White was ranked as the 59th overall prospect in baseball by
Baseball America, the 66th overall prospect by MLB Pipeline, and the 70th overall prospect by
The Athletic's
Keith Law during the 2023 off-season.[28][29][30] On November 15, 2022, the Rangers selected White to their
40-man roster to protect him from the
Rule 5 draft.[31]
White suffered neck inflammation in spring training and was optioned back to Frisco to begin the 2023 season.[32] In 11 starts for Frisco, he registered a 2–3 record and 3.54 ERA with 45 strikeouts in 53+1⁄3 innings pitched. On June 13, 2023, White was promoted to the major leagues for the first time.[33] He made his major league debut that night versus the
Los Angeles Angels in relief, allowing three runs over two innings and suffering the loss.[34] He was optioned back to Frisco following his debut. After a final appearance for Frisco, he was promoted to the
Round Rock Express of the
Triple-APacific Coast League on June 20.[35] White was selected to represent Texas in the 2023
All-Star Futures Game.[36]
White was optioned to Triple–A Round Rock to begin the 2024 season.[37] White was called up on April 19, 2024.[38]