Manual delivery, usually around half an hour, up to 24 hours max, and you'll be notified once it's delivered.
This is a US region Apple ID, the balance is already loaded into the account, and everything was checked before shipping. Log in to this account in iPhone "Settings" or the App Store, and you can use the balance to buy apps, subscriptions, and in-game purchases. If you want to check out the account first, you can log in https://account.apple.com Check. If you get a verification failed prompt when logging in, it's not an issue with the account; just restart the device and log in again.