I used Ford's website with the side view of all the vehicles in their lineup and the Mach E is about the same dimensions as an Edge. In terms of weight to power ratio, 4920 lb with 459 hp puts the GT at about the same as a tuned Explorer Sport which runs high 12s. But since the Mach E GT has 610 ftlb torque on tap I'd estimate it to run low 12s or maybe high 11s but the lack of power is not going to make it set any records. My SHO was 4300 lb and tuned made about 460 hp,and it ran 12.4 all day long. The new Explorer ST tuned makes about 520 hp and weighs 4700 lb and runs low 12s. EcoBoost doesn't have the same torque on tap as EV, but past 1st gear you are rarely below 4k RPM at WOT, so the torque is basically 450 to 500 ftlb all the way to the shift point when tuned.
TLDR, I think it will be about the same as an Edge or a Fusion with more ground clearance and a hatchback. The GT will probably run low 12s or high 11s in the 1/4.