[4] Estes made his professional debut with the Rookie-level Gulf Coast League Braves with whom he gave up nine earned runs over ten innings.

[5] Estes spent the 2021 season with the Augusta GreenJackets of the Low-A East, starting twenty games and pitching to a 3–6 record, a 2.91 ERA, and 127 strikeouts over 99 innings.

[8] On March 14, 2022, the Braves traded Estes, Shea Langeliers, Ryan Cusick, and Cristian Pache to the Oakland Athletics in exchange for Matt Olson.

[13] In early August, he was promoted to the Las Vegas Aviators of the Triple-A Pacific Coast League.

[14] In 27 games (23 starts) between the two affiliates, Estes posted a cumulative 9–6 record and 3.74 ERA with 131 strikeouts in 137.0 innings of work.