The chart above is from RealClearPolitics. It shows the latest polls on the race for the Democratic presidential nomination. And in the yellow bar of the chart, it shows the average of those polls. In the past, this RCP average has been more accurate than most individual polls.
Currently, that average of polls shows Joe Biden (at 27.8%) and Elizabeth Warren (at 26%) leading all other candidates. Bernie Sanders (15.2%) trails those two by more than 10 points, and Pete Buttigieg and Kamala Harris trail Sanders by more than 10 points.
Unless the next few debates, or some other action, changes things fairly radically, this looks like it is shaping up to be a race between Warren and Biden.