I've made several significant configuration changes since last December's delivery window update - R1T Explore -> R1T Adventure -> R1S Adventure (current). I'm looking forward to getting any sense of a delivery window, even knowing which half of which year to plan for.
If your reasoning for the delay is tough winters, I would want it sooner rather than later. The weight distribution, torque vectoring, and adjustable ride height are all major benefits in snowy conditions.