Who will join POTUS nominee Biden on the Democrat ticket as VP?

Back on the topic of our Democrat POTUS and VPOTUS nominees:

It is fair, I think, to assert Vice President Biden is now the presumptive POTUS nominee. A question:

Where is he? What has become of Mr. Biden? I’ve not heard so much as a peep for at least the last week.

Is he resting? How much rest does he require? Could he not provide us, for example, his short list of VP candidates? Has he no words at all of support and encouragement for Americans in our current, ongoing, crisis?

And does Mr. Biden remain healthy? I hope he is fine. But reassurance would be a good thing. This man, after all, could easily turn out to be our next POTUS!! He is a very important guy.