At what point will they 'lockdown' our bank accounts 'because of coronavirus'?

Why would they lock down bank accounts?
Besides, economy will collapse, but not because of the virus, but the hype around the virus.
Anyway, are you American? I don't really know what goes in your country, but in my country, people go to work, no decrease in infrastructural services, only schools are closed.

No, British. Boris Johnson has just 'ordered' lockdown.

They would lock down bank accounts to make sure that the people are powerless. They might be able to think up a naff reason why this is for public safety.