Yes.

> as far as I understood without physical money there would be no bank accounts.

I'm not sure why that would be the case. I've never withdrawn a physical dollar from my bank account.

> how could an economy go 100 percent electronic banking, if banking is built on the existence of physical cash? This is the missing link.

I don't think that's the point of CB digital currency. The point of CB's digital currency is to reduce the indirection between policy and business/consumer behavior.

NB: this includes both fiscal and monetary policy. So e.g. provides a mechanism to cut the retail banks out of things like covid relief funds.