Dragon Ball Super (2018), S05E129: Limits Super Surpassed! Ultra Instinct Mastered!!
Whis points out that, since Goku has no allies to help him and no time to recover from the strain caused by Ultra Instinct, this will be his last chance to end the battle. Goku and Jiren resume their battle, but Goku has the same problem he experienced with Kefla and is unable to attack at his full potential. Goku tries the same trick he used on Kefla, powering up a Kamehameha and firing it at Jiren, but Jiren is able to punch through the blast, although Goku manages to block the attack. Belmod is confident that Goku's incomplete Ultra Instinct will not be enough to win, but Vegeta points out that, throughout the tournament, all of the Saiyans have been able to surpass their limits and achieve higher levels of power. The battle resumes; Jiren is able to trap Goku on a single floating rock, while firing a barrage of attacks at him in an attempt to knock him out. Jiren fires a blast down on Goku, but Goku suddenly powers up immensely; he easily blocks Jiren's attack and jumps back up to the ring. Jiren attacks again, but this time Goku easily overpowers him with a flurry of punches. Whis reveals that Goku has completed his ascension: his hair has turned white, and he now has full mastery over Ultra Instinct.