I should also note that even without lifetime Supercharging, you will not he disappointed by your Model S. That benefit would only be really important for people who do a LOT of long distance driving. I recently used the superchargers for my Model 3, which does not have lifetime free charging, and the cost was extremely reasonable.
I saw your question about how to tell if you have lifetime Supercharging for a Model S that has not yet been delivered. I do not know, but to get it you needed a referral code to order the vehicle. I can make a referral for you, but you will need to ask Tesla if your order can still use it to get this benefit. It may not work.