are the banks bankrupt?

We get paid with no cash-efted to our accounts.
We go shopping-no cash emerges-we use credit cards.
Everything is a cashless society.
If there was a situation where people panicked & wanted real cash under their pillows & there was a run on banks-how many would get all their money in cash.
Should the banks have enough gold bullion to cover their supposed deposits, or at least some part of it.
I think most banks would struggle to find cash for more than 5% of their customers deposits.