2019s are slowly trickling in to my local dealers. Of the 6 dealer websites I looked at, most only have 1-5 on the lots, with quite a few more in transit.
Side note, saw my first 2019 in the wild yesterday! It was a Delmonico Red on the other side of the highway. I immediately recognized it as a Ram, but that might be because of how obsessively I've been reading anything and everything available about the 5th gens...
ETA: I'm in the DC area. I mostly take the metro to work, so I don't see much traffic during the week. Could be way more 2019s out there in this area, I just don't spend much time out on the roads.