[3][4] He returned as the starting tight end in 2020 where he had 57 receptions for 685 yards and 5 touchdowns.
[5][6][7] Long was selected by the Miami Dolphins in the third round (81st overall) of the 2021 NFL draft.
[11] Long signed his four-year rookie contract with Miami on July 26, 2021.
[12] On March 15, 2023, Long and a 2023 third-round draft pick (which was previously acquired from the New England Patriots) were traded to the Los Angeles Rams in exchange for cornerback Jalen Ramsey.
On December 8, 2024, Long scored his first NFL touchdown on a 22-yard blocked punt return during the Rams' 44–42 win over the Buffalo Bills.