They aren't on the road yet, I've been diligently looking for several months now.
Generally they start driving them around 3-6 months prior to unveiling, but right now they are probably limiting them to test tracks. Lately (ever since the first Chinese Tauruses were seen testing) spy shots haven't been trickling out until right around the time of unveiling (see Continental and MKX as prime examples). Trucks usually start road testing earlier, which is why the 2017 super dutys have been seen in heavy camo for 6 months now at least.