It depends on the poll you're citing. Quinnipiac poll has him at 37% approval. Of course, this poll is a highly leftist rag of a poll so I guess you can believe what you want in that leftist echo chamber.
Daily Mail has him at 55%. Daily Mail tends to lean right in its polls. I'm sure you don't believe anything from that poll.
Overall polling from all major pollsters sits at an average of 45% approval rating. But when you have 99% of the mainstream media against everything you do and lie about virtually everything you do, it tends to get low information voters riled up and believing the bullshit.
But at the end of the day, it doesn't really matter what the polls say, because the polls are mostly trash anyway. Remember when the polls had Hillary Clinton winning by a huge margin? Yeah, that turned out . . . . weird.