They have darkened that roof siluette picture, but if you adjust ligth settings you migth be able to get to see the groundline and put the template on it. At the moment that is a guess with 90% accuracy where the ground is. If I find the length details of the car its easy to verify the height with that by adjusting the dimension.
That roof curvature has that downward kick/dip section. In the ID3 aerodynamic video they were able to get lower drag in CFD if you put that kind of a dip to the end of the curvature.
edit: Found a high res picture at MB pages. Based on this I would guess there is coming active extension.
World digital premiere is 3.1.2022:
https://media.daimler.com/marsMediaS...l?oid=52215629