Nothing will help until your soil dries out. Any fertilizer you spread will be wasted money if the soil remains that wet.
After your soil dries and if the plants still have some yellow leaves, whether you fertilize or not depends on your goals. If your goal is to take nice pictures, where every leaf is nice and green, then by all means add nitrogen. If your goal is to improve your soil then don't add nitrogen and let the plants do their thing. Their root systems will dig deeper and wider to find the nitrogen, helping your soil in the process.
And if your goal is just about feeding deer, you'll have to watch and adjust. Chances are the deer won't eat your brassicas til after the first frost, when they're basically done anyway. So it'll be hard to judge if your plants are producing enough green leaves and large enough tubers to keep the deer fed until after the fact. I would leave them alone and make any adjustments next year.
If you grow a well rounded mix of legumes, cereal grains, broadleafs, and brassicas, without overworking your soil and destroying it's structure and microbiology, you shouldn't need to add lime or fertilizer. Everything will take care of itself.