ouch, sorry to hear about your accident
@Mike K. I feel your pain... My car is in the shop right now for almost identical damage

. Seriously, I don't have pics of mine, but if I photoshopped the car's colour your photo could be mine.
I see from your photo that the plastic bumper cover sheared in same spots as mine, near the vertex of the headlamp and at the little screw hole where it joins the fender bracket. In my case the bumper cover wasn't pulled off quite as far and slightly fewer components damaged than you - only 1 parking sensor damaged, radiator was fine but headlight housing and chrome nosecone-surround cracked. My left fender had no visible dents or scratches but needs replacing because a hidden aluminum tab sheared off underneath, where the bumper cover bracket attaches. Yeah you'd think just bolting on a new fender, no actual aluminum dent repair required, would be cheap and easy, but...
The repair work isn't yet complete, so I don't know the official repair total yet but I heard it's around Cdn$7k (covered by insurance). Note there are only two Tesla approved body shops in town here, both shops specialize in high-end/exotic cars... and I heard the certification process is long so I assume that factors into the cost justification. The shop was able to pre-order most of the parts before my actual repair appointment timeslot a few weeks later, but they didn't discover the cracked headlight until tearing things apart so unfortunately that's added delay. At least they've painted and prepped everything else while waiting for the part. It's a bit frustrating parts have to be ordered directly from Fremont, since there's a Tesla Service Centre just a couple blocks away. Not only that, driving a noisy, gutless, slow-shifting VW Jetta courtesy car while I wait to get my car back is painful!
p.s. I like your zip tie temporary repair. I did something similar but using rectagular slots at edge of the bumper cover and a couple corresponding hidden slots underneath. Zip ties were a bit bulky and stuck out so I cut those off and instead used a length of telepone wire twisted pair and managed to pull the gap tight and still hide the wire in the gap.
good luck with your repair!