If you read the terms&conditions of any credit card, including a Apply now
balance transfer credit card, you will see that you can never start using a credit card the same day you applied for it. You fill out an application and send it to the bank, so the bank evaluates it and sends you a reply (approval or disapproval), which can happen within several days since the day of application. You should also receive the credit card itself, which can happen in several days up to a month. Only after you receive your credit card and activate it, you will be able to use it, which can never be done the day you apply for it.
All credit cards terms, fees and rates mentioned in this article/post are actual on the posting date. See the current products’ Terms & Conditions on the issuing banks' websites.