What age should a baby be potty trained by? Read first please!

I made a comment about my MIL’s youngest child not being potty trained and is almost 3 and someone said “wow he should be potty trained by now that’s a little much”. Their argument was that the kid is pretty big already he knows right from wrong, he’s pretty advanced other than thisbut he still goes in his diaper all the time like he isn’t even close to being potty trained. Partly because my mother-in-law doesn’t really pay attention to her kids and they aren’t really working with him on it they bought him a mini potty but they used it for like a week and then put it away. I know every kid is different and they do things at their own pace but generally

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