I don't understand what "value" means here. There is a large number of "jobs", maybe even majority of jobs, which without a modern society would not function. Would you then calculate the value of these jobs as the value of modern society divided by the number of employed people with the given job?
Before or after overtime? My understanding is that here in Canada most nurses doing shift work make 6 figures. Hospitals are understaffed so there's lots of overtime available, and of course nursing is a 24/7 job. The night shift premium and the overtime premium multiply so picking up a single extra night shift can gross $1000.
Nurses in the U.K. don't get overtime. They can join bank nursing which is like a separate pool of nurses to cover these gaps. Pay is a bit higher but not by much.