The agricultural revolution has been very beneficial for feeding more people with less labor inputs, but I'm kind of skeptical of the claim that it led to weekends (and the 40hr workweek). Those seem to have come from the efforts of the labor movement on the manufacturing side of things (late 19th, early 20th century). Business interests would have continued to work people 12hrs a day 7 days a week (plus child labor) to maximize profits regardless of increasing agricultural efficiency.