Unfortunately probably not. Here's the math.
420K reservations. Half US == 210K reservations. About 1/3 "SR" and about 2/3 "LR" based on polling at Electrek == 140K US LR reservations.
26K delivered through June, 50K in Q3, 72K (if they hit 6000/week and stay there for 12 weeks, with Christmas break) in Q4 == 148K... but that last two weeks' production wouldn't be delivered until January.
Honestly? Expect your car in early January. Sorry, there were *sooo* many people who reserved who wanted the LR version.
Your best chance of getting your car in December is if Tesla's ramp up goes quicker than expected and they're marching into 7000 or 8000 per week in Q4. Then you probably will get it in December. But betting on Tesla's ramp going quicker than expected is a pretty bad bet.
One way you might get your SR in December is if there are a bunch of people who want LR but don't want the premium interior, and Tesla introduces the SR version before introducing the non-premium interior. Of course you'd have to get the premium interior to get it in December then.