When Vegeta returned to Earth he bragged to Goku about his new found power, Goku then walked away to train.
4 hours later:Lord Beerus's planet
Vegeta found Goku talking to Whis, as Vegeta walked up to Whis he was greeted and asked about this new form. The new name for this form was Super Saiyan Ultra, Goku then complained about how that isn't fair and that nothing is stronger than Ultra Instinct. Vegeta scoffed and challenged Goku to a battle in which they would not hold back, Goku accepted. They both transformed into their strongest form and Vegeta jumped at Goku but Goku's Defensive Ultra Instinct was able to avoid the fierce punch, within the blink of an eye Goku switched to offensive and landed a punch that would send anyone into a deep sleep. As the dust cleared Goku smiled but before he could say anything he heard the words "Final Flash". Vegeta had not even been skimmed and in the time given Z-Vanished behind Goku and had charged up a final flash. The impact was one that would even shake Beerus up.
Whis knew that Goku would soon catch up and that this power was far from the limit