TV App prompt is up and running now, at least where I am, which is New York. This is how you get the prompt to come up, per the article:
"Apple TV users with a DirecTV Now subscription will see a prompt to integrate their data with the TV app after playing a DVR show for the first time."

"Apple TV users with a DirecTV Now subscription will see a prompt to integrate their data with the TV app after playing a DVR show for the first time."
