Verified answer

You might not, because now you have to be at least 21 years of age to even qualify for credit, no matter what card it is. If you have an adult that can cosign for you, that would be different. If you're approved, the card just comes. If not, you'd receive an adverse action letter explaining the reason why you were declined: age (if too young only), not enough income, not enough credit/no credit history to name a few.

If you don't already have another card, then this one wasn't approved. Chase doesn't give out credit cards to 18-year-olds who don't already have one. You have to get another one (such as Capital One) first, before you apply for a Chase card.

They will send you a mail. Wait for the mail to arrive in your mailbox and if it doesn't, you can send them an e-mail regarding this or call them up.