Let's say we have a world where magic is so powerful that essentially all labor requirements are obviated - a single mage can build a castle in a day, instantly plant and later harvest a large field, in a matter of hours extract and refine all ore from a mountain, etc. They do this either directly, by construction of magically powered machines, summoning of demons and so on. Magic can only apply energy in various forms to the world, but not alter its properties - e.g. it's impossible to have plants grow instantly, teleport or create things from nothing.
Let's examine two potential scenarios. Both can be further differentiated by the number of potential magic users - either it can be wielded either by a small (<5% of the population) caste of mages or by everyone. In either case, mages don't require more nutrition than a muggle or any specific external resources.
Our society is in the late hunter-gatherer stage. Magic has been known for many generations and has provided plentiful hunting yields. IRL by now we would be discovering agriculture and settling down. Would there still be any reason to do so with magic? If yes, how would the society evolve from there?
It's a normal magic-less medieval/renaissance setting and the magic appears suddenly by being brought by arriving traders/discovered by mad scientists/just out of thin air. How does the society change to accomodate the new addition?