How and when will I receive notice to move my email account to Yahoo?

Read notice that xfinity is transferring email, if so desired, accounts to the Yahoo email platform. the notice said you would be notified by October, but does not say how you will be notified when to move your email account. since it's mid September and I have not been able to find out how you will be notified. It also states you only have a limited time to do so.