Biden needs 430-440 Delegates out of the 500 available to clinch the Nomination.
Wait, meaning there's only 500 delegates left?
No, there are only 500 Pledged Delegates available on June 2nd when 7 States (Montana, South Dakota, New Mexico, Indiana, Maryland, Pennsylvania and Rhode Island) + DC are voting.
Biden needs a bare minimum of 430 out of the 500 on June 2nd to clinch.
So he could theoretically clinch it on June 2, but doesn't really need to?
The sooner he clinches the better for him. He will almost certainly clinch it on June 7th when Goergia and West Virginia vote.
He got them today, June 5.