Delivery is going to depend on what you specified for your car and then when one like that is built and is available to your dealer. Sometimes dealers will look for a car to your specs that's already in the district and get it for you.
When you order a car though Lexus, they just don't build the car for you. They get dibs on a car like you want, and then when it's there, it's there.
If you're thinking of avoiding tax by getting a car from out of state, that won't work because you'll have to pay the tax when you register the car in your home state.
Whichever is your state of residence, that's where you pay the taxes. I don't make laws, that's just the way it is. Don't believe me, ask the DMV.