[5] The Los Angeles Dodgers selected McKinstry in the 33rd round of the 2016 Major League Baseball draft, and signed with the team on July 8.

[4] He returned to the Loons to start 2018, but maintained a positive attitude about the demotion and improved his batting average and his walk ratio.

[11] After hitting .279 with 12 homers and 52 RBI in 95 games for Tulsa[4] he was promoted to the Triple-A Oklahoma City Dodgers of the Pacific Coast League on August 3.

[14] He was called up again on September 16, where he made his MLB debut as a pinch hitter against the San Diego Padres, striking out in his first at-bat.

[15] His first major league hit was a double to left field off of Antonio Senzatela of the Colorado Rockies on September 20.

[17] On April 3, 2021, McKinstry hit his first career major league home run, in the top of the eighth inning off of Rockies pitcher Mychal Givens.

[19] McKinstry appeared in 47 games for the Cubs down the stretch, slashing .207/.272/.361 with 4 home runs, 12 RBI, and 7 stolen bases.