I couldn't find any papers in the literature on RAT sensitivity as a function of time for Omicron-specific patients, either as measured from infection, from PCR positivity, or from symptoms.
Symptoms is probably the best I can hope for in this case, but I'd take anything really.

Thanks to all who noticed and asked questions about this distribution, it's critical information, and I'm surprised that some public health agency hasn't pulled this together for us all.