Welcome to the Community Forums and thanks for the post.
With regards to your switchover, if you are currently being migrated over, you would have received a letter confirming this along with your adaptor to plug in, this letter would state the date of your switchover.
Thanks for getting back to me, on the letter with the adaptor are no dates mentioned there? If not you may have also received an email/text with regards to this, you may want to check your junk/spam folder.
Its no problem that you cannot find this, I will be able to confirm this with you once I gather some information from you in a private message, if you have not used this feature before you can access it via the envelope at the top of your screen.