It is true that relatively more money has gone to higher earners. As evidenced by the ratio of mean to median increasing over that time period.
I'm not really sure what you mean by a generic worker.
Do you have reference for this claim? That really wouldn’t make any sense. The appropriate technical term for median income is “median income”. “Per capita” always implies total divided by population, i.e. the mean.
Here is the US Census’s definition: https://www.census.gov/quickfacts/fact/note/US/INC910217
> Definition
> Per capita income is the mean income computed for every man, woman, and child in a particular group including those living in group quarters. It is derived by dividing the aggregate income of a particular group by the total population in that group.