I opened a few days ago account developer Apple and have not confirmed it to me. After how many have you confirmed your developer account?
The payment verification might take a few days (in some cases up to two weeks). Once approved, your iTunes Connect account will automatically be opened by Apple (submitting an app to the Apple App Store requires an iTunes connect account, which is separate from a developer account).
Will they send me a message when my account is available?
Yes once payment and other details are confirmed