Actually if the Officials Jurisdiction begins 30 minutes prior to the game it becomes almost impossible to see the formations/punters kicking/centers snapping the ball during warm-ups because by that time the teams are usually headed back to the locker rooms.
That is the situation in most games we see. Some folks will say to go out before 30 minutes, so you can make those observations. I'm not in charge, and this is strictly one man's opinion, but I strongly suggest that you DON'T go out before 30 minutes, with both teams on the field. I've talked about this before. If something were to happen, you are opening yourself up to being involved in litigation, either as a witness or, more likely, as a defendant. You need an example? OK, this is fictitious, but a plausible scenario:
You enter the field 40 minutes prior to scheduled kickoff, and begin checking the field, observing teams, visiting with chain crew, etc. Both teams are on the field, warming up. At 35 minutes before kickoff, Home 11 (star senior QB, committed to Alabama) and Visitor 99 get into verbal 'spat' at mid-field. With no physical provocation, V99 grabs and slams H11 to the ground, with H11 suffering a broken arm. Home coach wants a flag and DQ for Visitor 99. H11's parents want V99 arrested. You say, "Sorry, Coach, our jurisdiction doesn't start until 30 minutes before kickoff.
If you go out with both teams out there - other than to perform the requisite head coach's conference (especially in 2020, with COVID protocols) - every plaintiff's attorney on the planet is going to claim that, by being there, your jurisdiction has started, and you accept responsibility for events that occur during that period. And, you should have seen this precipitating, and should have done something to prevent any physical interaction, and you should have penalized and disqualified V99. Your defense will be that your jurisdiction doesn't start until 30 minutes. A half-way decent attorney will make that argument almost a non-starter. Hopefully, TASO's attorneys will have a better counter-argument.
On the other hand, you don't go out until 30 minutes, and that activity has already occurred, you can point to the UIL's policy that your jurisdiction begins at 30 minutes before kickoff. Sorry, but you had no jurisdiction before 30 minutes, and didn't see any of the alleged action, and can't offer any help. TASO's attorney's will have an easy time with that.
IMHO.