This old sense is encountered, like in your example, but much more often "fruits" is used in the culinary sense.
Many people perceive your example as a metaphor, the results of the labor being compared with the fruits of a tree, but in reality the direction of the metaphor has historically been opposite, the fruits of the tree being called thus because they were considered the useful results of its cultivation.
That it what I mean.
This old sense is encountered, like in your example, but much more often "fruits" is used in the culinary sense.
Many people perceive your example as a metaphor, the results of the labor being compared with the fruits of a tree, but in reality the direction of the metaphor has historically been opposite, the fruits of the tree being called thus because they were considered the useful results of its cultivation.