The chart above is from the latest Dallas Morning News / University of Texas at Tyler Poll -- done between October 13th and 20th of a sample of 1,012 registered Texas voters, with a 3.08 point margin of error.
The poll has Biden leading by 2 points (46% to 44%), but with the margin of error the poll has Biden and Trump in a virtual tie. The most that can be said is the state is still in play, and the candidate that does the best job of getting out his voters will win.