What would that wheat field grow, like two loaves of bread?
Quick maffs, 1 acre can produce 2.3 tons of wheat per growing year. The image looks like about one-sixteenth of the acre is dedicated to grain. That divides out to 140 kg of wheat per year. Maybe you lose 10% of the mass from suboptimal grinding to flour, that's 126 kg of flour per year. 400g of flour per loaf of bread means you could make 315 loaves from 1/16 of a square acre.