The charts above are from RealClearPolitics.com.
The top chart shows the polling of voters. Note that Joe Biden has led Donald Trump in the voters polls for all of this year, and his polling advantage has been remarkably stable. Currently, Biden has a 4.4 advantage in the average of the most recent polls.
The bottom chart shows who the betting sites think will win the 2020 election. Those sites all give Trump the better chances to win. Currently, Trump has a 7.9 point advantage in the average of the betting sites.
Are the voter polls right or the betting sites?