Sorry for confusion. The OP asked if it was on the ships YET. As far as I have heard, some Suite guests, on some ships have been able to order the UBD through their concierge.
I have been told since the restart first
due to covid, then due to staff shortages. But, always call the dining line, in case that ship can accommodate.
Suite guests may be able because of their perks and there aren’t that many full suites
comparatively.
Which is a good thing, maybe they will open it for others. I hope so.