Look left in this photo of the observatory housing the scope. The scope is 10,000mm focal length f/1.24 or something like that. Will pick up light pollution pretty quick so that area is off limits to the scope. But it's likely I guess the scope which
is a widesky survey instrument, will image portions of the sky when it's as "high" as possible, but obviously some parts of the sky, the shallow south will not be imaged.
https://en.wikipedia.org/wiki/Vera_C._Rubin_Observatory#/media/File:Rubin_Observatory_and_Its_Target.jpg
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