You forgot about eggs and their heavy use in things such as baking. I suppose you can grow an egg in a lab but producing a fully fledged quasi-viable cell is more difficult than a hunk of muscle tissue.
You could probably grow the egg proteins, or a subset, separately easier than growing meat. They already do this for cultured cow milk. They even skip the lactose to make it easier and more digestible. Maybe we’ll be able to buy cultured egg whites and yolks at whatever ratio we want.
Once vegans take over the world, there will be no reason (and no economic basis) for chickens or cows to exist at all. But there will be less methane emissions and animal suffering.
Come to think of it, the best to live is some place like the Moon that has negligible methane and no animal suffering.