Thank you all for your comments and suggestions. I have been reading them all.
... That said, as soon as there is clear indication one way or another on the bills, we'll schedule delivery.
Anyways, I appreciate all the tips and info, keep it coming please.
Many good comments already. Here's my take based on owning three Teslas since 2014 and operating a few others, including some non-Tesla ones:
1. Using a Tesla wall charger is usually a trifle expensive if you care about the price. Generic EV wall chargers come with a J1772 outlet that allows you to use the adapter that comes with your car, rather than the separate adapter. Realistically you'll probably charge overnight so anything 208/30 or better is all you need. Please don't let anybody convince you that you need more amperage or the Tesla Wall Connector. You don't unless you really need to fully charge your car in four hours or so. Anyway, all over there are charging points in shopping centers, hotels and elsewhere. Plugshare is crucial:
Find EV charging stations with PlugShare, the most complete map of electric vehicle charging stations in the world!Charging tips reviews and photos from the EV community.
www.plugshare.com
I started there rather than on purchase timing and tax benefits. Why? Because the most important benefits from Tesla in my opinion are:
1. Near-total lack of required maintenance. That saves money, time and irritation;
2. Zero gasoline station visits. You won't think of that until you o longer do it;
3. Charging at home and charging on trips at hotels. Most of the time, on major trips (Milan-Dubrovnik, Miami-Halifax, San Francisco-Atlanta and many more) I often end out charging overnight at hotels then during the day when I stop for lunch or breaks. Using Plugshare etc ends out allowing better planning so using less pure charging stops. FWIW, my personal habits are such that even with long trips I haven't used a Supercharger since I bought my latest Tesla.
4. The big maintenance item is tires. That ends out making a Tesla far cheaper to operate than any ICE.
So, with those four factors the tax benefits tend to fade quickly. As a result I probably would not change purchase plans based on hypothetical tax benefits. Were they not hypothetical I'd probably weigh the timing a little bit.
Then, aftermarket adds:
1. I do strongly recommend protective covering for the front, lower sides and, now available, windshield. That saves money and preserves aesthetics.
2. Mats etc are personal choice. I do not do them myself.
3. Screen protectors are, for me, essential. You'll be using the touch sensitive screen every trip and more. With a protective screen it will be easier to clean and have less glare. I use Abstract Ocean but there are quite a few good ones, my choice is partly habit.
For me, that is it.
Spare tires- not for me. I had one flat tire in Tesla-driving for the last seven years. That was just after buying my new one, a Model S Plaid. I was charging at a hotel when a construction residue nail took out a tire, 850 miles after delivery. The Tesla mobile tire repair/repalcement arrived in 30 minutes and repaired the tire on the spot. So long as one can depend on that I skip the spare.
FWIW, on mobile service in general. Back in 2016 I was in a Model S70 driving through remote Wyoming when the car had a diminished power warning. I struggled to reach a small roadside hotel where I called Tesla Roadside Service. They diagnosed the problem in seconds (OTA is magic!), let me continue to drive to Denver where the Tesla Service Center made the required hardware fix. That was late Saturday afternoon, they were allegedly closed.
These anecdotes are typical of why many of us might not make changes to timing for uncertain tax benefits.
Please don't confuse my ownership comments with praise for the buying process. The process is stellar if there are no issues. It is really irritating if there are. Even with the poor sales support it has been, for me, a huge benefit to eliminate dealers from my US life.