OK folks. Confirming that DFW has an Enroll on Arrival separate immigration booth - booth 60 which is the very furthest away from the Global Entry machines. The line manager told me about it when I asked. My BA193 arrived on time. I deplaned at 1702hrs, hit booth 60 at 1708hrs, and my “interview” was completed 1 minute later. Absolutely superb service.
havnt had the email confirmation yet but the agent said 24-48 hours. He didn’t even look at or scan my passport and said the camera recognised me already from previous visits.
good luck all.