Grealish has endured a sluggish, injury-hit start to the season but came racing out of the traps at Molineux to score after just 55 seconds.
Erling Haaland and Phil Foden wrapped up the victory against a Wolves side who saw Nathan Collins sent off in the first half, and Grealish's relief at a much-improved performance was after the game clear.
"It’s been a long time coming," Grealish said of his goal. "I think it was the West Ham game at the back end of last season [when I last scored]. It was nice to get off the mark for this season and to do it so early and get the three points.
"This is a difficult place to come and a top, top team. I think they are so underrated this Wolves team and they showed it at points during the second half. It’s a great result for us."
Asked about the criticism he has this week faced, Grealish replied: "Rightly so. I should be scoring more, I should be getting more assists so the only thing I can do is try to score and get assists.
"I’m always going to have people talking about me because of the amount I got bought for but if you look at my whole career, I probably haven’t scored as much as certain people. It’s something that I do want to add to my game."