Going by the most recent polls, Bernie picks up about 200 more delegates tomorrow than Biden gets. It will be about 800-570 in 40 hours, Bernie over Biden, in the race to delegate #1991... and Bloomberg will likely be pulling more from Biden than from Bernie... and Klobuchar's votes are likely going over to Bernie (Mayor Pete's to Biden)...
(Scuttlebutt is that the DNC wants Warren to stay in, to keep taking Bernie votes away.)
538.com has Bernie with a 50-50 chance of getting the 1991st delegate and (probably) avoiding the 771 "superdelegates" that only become a factor if Bernie fails to win on the first ballot in Milwaukee. Biden only has a 16% chance of getting to #1991.
Yep, it's that 50-50 that has the Dem establishment pulling out all the stops today and into the next months.