It happened at around 7pm ET today. Here's the slides from my Nexstar station, WBRE/NBC 28 and NewsNation.
(although since I took these, 28 is currently showing the same slate that 28-9 is showing, but they have yet to remove 28-9 from the guide)
(although since I took these, 28 is currently showing the same slate that 28-9 is showing, but they have yet to remove 28-9 from the guide)