The above figure suggests that 22.7% of all acres devoted to growing lettuce in the US were certified organic. For eggs, 3.6% were organic. For wheat acres, only 0.7% were organic. Only 0.1% of beef cows were organic, and 001% of hogs and pigs were organic.
It is important to note that the amount of acreage devoted to lettuce, carrots, apples, and snap beans is tiny compared to corn, soy, and wheat. For example, in 2015, about 1.2 million acres were devoted to lettuce, carrots, apples, and snap beans - an amount that is only 1.4% of the amount of land devoted to corn alone. The point is that even though fruits and vegetables seem to have a higher share devoted to organic than commodity crops, because commodity crops account for the vast majority of land farmed , the total or overall share of cropland in organic remains very small. For corn, soybeans, and wheat acreage combined, only 1% of the land is organic.
Here's a similar figure but calculated instead as a share of the value of production (i.e., the share of dollars).