That's a whopper billy in 2ptdown's 2 photos. The mass is excellent! Just like all horned game, mass is the largest chunk of the score for goats.
I've been on a gob of goat hunts over the years in Colorado and Alaska. There are very few B&C goats here in Colo so a trophy to me is a long coat and older age billy. In fact, I've been out the past few weeks scouting here in Colo. Utah has better genetics for massive goats than Colo. I'd take full advantage of your tag!
I would not use a blocky, mule head as the deciding factor between a nanny and billy. Old nannies often have blocky heads. A mature (5+year old) billie's body dwarfs nanny and younger billies.
Right now about all nannies still have scraggy hair and just about all billies have slick new hair. That is one of the quickest ways this time of year to distinguish nannies from billies. The hair on mature billies right now is fairly short but will be dramatically growing every week for the next month. If it were me and you have a selection of billies I would wait it out for longer hair. The hair on the billy 2ptdown's photo is about double the length of the billies hair I'm seeing right now in Colo. We've had a super hot summer and August so that may be part of it this year?
My guess is that Utah is fairly similar to Colo. It can be a blizzard one day and sunny 70 degrees the next. Snow usually doesn't last long until deeper snows in mid to late October. Just wait for a chunk of nicer weather. If you are flexible with weather it would make life easier. Some road access may shut off but it really depends upon the area. If there is a decent road with access a late hunt is generally easier.
I have written a multi-page document with goat judging, trophy field care, and hunting tips. PM me and I would be glad to send you the document or answer any questions. I've lost count of how many goats I've helped family and friends hunt over the years and have learned a great deal watching, filming, and hunting them over the years.