In my experience there are a few factors that directly affect if your vehicle totals:
-First, if there is significant hidden damage behind the bumper and hood. This hit looks high so it could have missed the front rails. Once a certified body shop tears it down and blueprints the vehicle they will be able to tell you/ insurance company.
-Second, and this is the most important in my experience, is if your insurance is ready/willing to cover the cost of repairs. It depends which company you have and the rates they are willing to pay to fix Tesla.
-Third being the value of your car. 2018s hold their value very well. In my experience (Blue Printer/ Repair Technician for a Tesla Certified Body Shop) we have fixed worse front end hits in the past, and we rarely ever total Teslas. Thr only exception is if the insurance company doesn't want to pay our rates or the vehicle is really really messed up.
Just my 2 cents. Hard to be certain until the car is fully disassembled and inspected.
Sorry for your accident! Hope you're doing alright.