Initially you won't. We've set the clients up intentionally so as not
to alert the user if a candidate key is found. The clients only perform
a partial message decryption and it is quite possible for them to generate false positives. There is no need to get excited until the key has been verified.
If your computer does find the winning key you will be notified by
e-mail after the key has been verified by RSA. This is one reason
why it is so important that you submit keys using a valid e-mail