Right now, Biden is deeply unpopular, with an approval rating below 40% since March of this year. His favorability rating currently sits at 38.7. I know Trump is unpopular as well, but Biden can't win with those numbers. Trumps favorability rating is currently 41.7%, giving him nearly a 3 point lead in favorability. This jives with current head to head polling as well, as Trump has a 2 point advantage nationally.
It's also important to remember that in 2020, Biden had a 4-10 point lead nationally (and comfortable leads in swing states like PA, MI, and WI) from the moment he won the nomination until election day. While he did maintain the popular vote spread in the election (winning by 4.4 points), he narrowly won those key swing states.
If the election were held today, Trump wins in a blowout. Probably secures 320+ electoral votes and probably takes the popular vote as well. But there is enough time till election and it's close enough that Trump could still fumble the bag and/or Biden could rally.