In my opinion, if you are not on drugs and want to do keto/carnivore right, forget about "lean meats" and "egg whites."
Eat fatty meats: Ribeye, NY Strip, chuck roast, fatty ground beef, pork belly, bacon, chicken dark meat with the skin on, etc.
Eat whole eggs or just the yolks. The yolks are mostly fat, but have some protein too.
If you are going to practice carb restriction, you're gonna have to eat around 70% fat for energy, fat soluble vitamins, normal hormone function, normal digestion, essential fatty acids, and in order educe ketosis.
Protein + carbs should stay around 30%, with most of that coming from protein and very little to nothing from carbs. With the high protein bio-availability from animal products and without anti-nutrients from plants, you won't need as much protein as someone eating a high carb diet that includes plants.