The boost is a fair bit larger than the gap between SS2 and SS3 in GT, so I'd go with it being about 6x. Manga-wise, he'd likely still get wrecked by any Hakaishin tier, but would stomp anyone below it.
Anime-wise with SSBE as the trigger, he probably beats those of Hakaishin tier and the Angels, though how he'd fare against the Daishinkan is impossible to say due to his lack of feats for clear scaling with the only known thing about him being the vague statement of him being far above Whis. He's still not touching Zen-Oh regardless.