If you want to see numbers that relate to a particular output usage (such as, previewing what numbers you WOULD get if you happened to export this particular image, edited as it currently is, to sRGB) then you can soft-proof the image (S key shortcut) selecting that particular output colour space in the panel at top right of Develop.
The colour numbers you'll see if you've soft-proofed to a particular printer/paper profile are not very helpful; but those you'll see when soft-proofing for a standard colourspace such as sRGB might be more so (such as, in meeting specifications for how a client's logo should appear according to that particular colour system).
Otherwise these % figures still ARE "real" and repeatable: being colour coordinates within a systematic and objectively meaningful colour system - Lightroom's own internal colour space.
One benefit is that each image displayed within Develop that is not individually soft-proofed
always shows colour values that are consistent and usage-neutral.