I got a bull some years back that looks like a twin to that one aside from maybe his thirds being a couple inches shorter than the one in your video, though his width is 43 inches, and mine scored 318.
The majority of folks tend to guess 10 to 20 inches high in the moment.
I'd guess 323 - 326 max with the possibility of reaching 330-338.
when done I think he is closer to 340 than 320. When was the picture taken. The bull next to him looks like he has 2-3 weeks more growing time. By the first part of August should be done.