I work about that many hours too so to save energy, I do Walmart grocery pick up and meal prep for 2-3 days ahead of time with the instant pot or crock pot. The crock pot is my friend because I literally have to do nothing but plate it when I get home. I also eat whatever I had for dinner as lunch the day after. Breakfast is usually egg cups I prepped on Sunday or breakfast burritos that I freeze! You got this!