Don't polish the car until it needs it. Unless your dealership completely mucks it up, I seriously doubt your car's paint would need correction brand new from the factory.
Considering you're in NC, I tend to doubt you'd need to clay your X3 either. You're right near the factory, so I can't imagine you'd be exposed to anything so quickly. You'll just need to evaluate the paint when you take delivery.
I bet all you'll need is a good wash, glaze (optional), sealant, and wax.
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