I'm afraid to tell you the standards are not great. And not high enough.
By that I mean you would never allow your dog (as a dog owner this goes for me) to live in these conditions. It's brutal.
Particularly for pigs and meat birds.
Dairy is also grim. One of the worst apparently.
Unfortunately the standards don't go far enough.
In an ideal world, the animal would live a relatively natural life, outdoors, without genetics which promote discomfort.
They would be killed cleanly.. And not in slaughter houses. Many animals are intelligent enough (especially pigs) to know what's going on.
No idea how we get away from slaughter houses. That part is super grim. Animals missing being stunned etc.
The answer to that isn’t veganism though. Exchanging one problem for a bigger more unsustainable problem just adds to the list challenges. Moral blackmail isn’t helping anyone.
The natural world isn’t going to make an exception for our feelings. We are witnessing the consequences of previous generations actions, as our future generations will witness ours. Our children and grandchildren may forgive us, but the natural world will not.
The frustration in all this is we have held the ability to avoid this situation for decades and should have much greater freedom of choice.