For a running survey of the state polls, you could try https://www.electoral-vote.com/
They keep a running total of the most recent polls, state-by-state, and produce a map of the electoral votes based on their polls. Of course, that means that the polling data for some states may lag a bit, especially for smaller states that don’t get polled very much.
Unlike Nate, they don’t have a “secret sauce” where they try to weight polling results by an algorithm, and they don’t use national polls.
Their focus is on making sure that the polling groups that produce polls for a state are reputable and not biased, so they exclude polls from polling groups that primarily work for either party, new groups that don’t appear to have a track record of any sort, and so on. They then use the most recent two or three polls for each state, to give a current projection for the electoral votes for each state.
They are left-leaning in their commentary, but their reporting on the polls themselves seems pretty even-handed, and they have a good track record for past elections. They missed it in 2016, but then, the polls that were being produced that year also missed it.
They have an unfortunate tendency to use “humorous” ethnic slurs in their commentary, so I don’t read them much, but I check their electoral vote projections now and then.
As of this morning (August 2), based on the most current polls, their electoral vote tally is:
Trump: 270
Harris: 247
By comparison, their tally on July 21, the date of Biden’s announcement, was:
Trump: 310
Biden: 218
I know a few other Dopers frequent that site.