This quite simple process of how to transfer apple cash to bank.
How to Deposit Apple Cash in a Bank Account

On an iPhone, follow these steps to transfer Apple Cash to a bank account:

Look in your wallet.
Select your Apple Cash card.
In the top right corner of your screen, tap the three dots inside a circle.
Tap the second option, "Transfer to Bank," which has an arrow next to it.
On an iPad, follow these steps to transfer Apple Cash to a bank account:
Navigate to the Settings app.
Select Wallet.
Choose Apple Pay.
Select your Apple Cash card.
Select "Transfer to Bank."

Transfer in 1 to 3 business days to a bank account
Go to your card info: On iPhone: Open the Wallet app, tap your Apple Cash card, tap the More button. ...
Enter an amount and tap Next.
Tap 1-3 Business Days. If you don't have a bank account set up, follow the instructions on your screen to add one.
Tap Transfer.

Regards,
Diana