A severely weaker version of Beerus than the one Vegeta fought, was already considered stronger than Vegetto. Next, Beerus was forced to 10% of his battle power. Afterwards, Goku's initial transformation into Saiyan God blew past all his predetermined expectations for God tier power, Beerus & Vegetto. Yet, he's unable to even hit Beerus and he undergoes 3-4 additional power-ups throughout his fight with Beerus
So Vegeta is probably as powerful as Super Vegetto, at the very least. In more likeliness, he's surpassed SSJ3 Vegetto.