No Trump's approval is not at 49%, that is an outlier. He has remained about 40% for most of his Presidency, it consistence ticks up and down one or two points.
https://projects.fivethirtyeight.com...roval-ratings/
The polls also show that half the voters will not vote for him. He will lose the popular vote again, probably more than last time. But because of the Electoral College, he can take the election, even if he loses by 5 million votes this time.