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The CvB is the holy grail. But it is an insanely challenging detection problem. I think the (multidecade?) PTOLEMY experiment is the only serious proposal, and particle physicists I knew were pretty skeptical it could actually pull it off for SM neutrinos.

https://arxiv.org/abs/1902.05508

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I used to work in neutrino physics, and I will consider myself lucky if I see a detection of the cosmic neutrino background in my lifetime (roughly the next 50 years).

Interesting, I read about neutrinos a while back https://arxiv.org/pdf/2304.14995

https://www.universetoday.com/13052/do-advanced-civilization... (I was reminded of this recently after watching the Three Body Problem - Tencent's version, interstellar quantum communication)

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