I have two Roku TVs and neither one are on OS 9 yet however all my Roku boxes are. When is OS 9 coming to my TVs?
Back on September 24, 2018, when Roku announced OS 9, they said:
Roku OS 9 will begin rolling out to Roku streaming players in early November and Roku TVs early next year. It is expected to be completed in Q1 2019. For more information on Roku OS 9, click here
What you're describing fits this. It's still Q1, and will be for the next 36 days. So, some time before April 1. Unless something goes wrong with the rollout. If that happens, they'll post about it.
What they didn't say, but is true, is not all of a particular model will necessarily get the update at the same time. One of my Ultra boxes got v9 in October, and another got it in December. Same model device on the same account. So, it is possible both of your TVs will get it at the same time, or one could get it before the other. But, as Roku stated months ago, before April 1.
Roku hasn't announced any timeline specifics beyond what you'll find at https://blog.roku.com/
, which is where their announcements are posted.