Physical cards typically arrive 7-10 business days after you create your Found account.
In the meantime, you can still use your Found card before the physical card arrives! You can access your card number, expiration date, and security code in your Found app by clicking on the debit card icon in the middle of your screen, and enabling the "Show card information" setting. You can also link your card to Google Pay, or payment apps like Venmo or PayPal.