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Cyber truck, Large windshield, Large amount of heat from Sun into cabin

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The heat rejection layer on the windshield of my Model X does a very good job where it's applied. It's only where the headliner would traditionally go, and I usually only notice radiant sun from the side windows since I'm not often driving into the setting/rising sun. It doesn't seem like the Model 3 has the same heat rejection, as I'm seeing lots of posts commenting about it being only privacy and asking for recommendations on heat rejection tint. For cost savings, I could see the Cybertruck going this route too, so you might want to start looking into heat rejection film.
 
I have concern that the extra large, nearly horizontal windshield will let in too much heat in these hot 100 degrF heat summer days. Anyone else concerned about this

A little, yes.
I live in NE, so my level of concern is way lower than yours.
Either way, there is nothing we can do about it.
Tesla is obsessed with glass roofs, for whatever reason. If you truly want a metal roof for proper sound and heat insulation, look into Rivian or Lucid.