In South Africa, white people definitely still benefit from the legacy of apartheid, and it's literally absurd on its face to state otherwise. Even if we consider all white South Africans to not be actively racist (which, given then apartheid ended, what, 20, 25 years ago? I highly doubt it), they absolutely benefit from the legacy from the legacy of apartheid policies, which would be they benefit from institutional racism. Racism (in the sociological sense) is about social relations, not individualized behavioural patterns--who has power in this relationships, why do they have power, and how do they use that power. In North America (including Canada--which I'll include here because apparently some of our Canadian residences here seem to think this doesn't include Canada) those who have power in the vast majority of contexts are white people, the reason they have this power is not only because of slavery, but also a long, long history of racialized policies made specifically to harm black people to the benefit of white people (obviously the shitshow of Reconstruction, and Jim Crow, but also overpolicing, redlining, eugenic programs, denying them benefits that whites got, like the GI Bill, to today with the War on Drugs), that is both formal and informal. Medical professionals often report racist beliefs, like how black people don't feel as pain, or like in Canada where First Nation peoples have longer wait periods because they are believed to faking (or occasionally die in hospital waiting rooms because the nurses or doctors believe they are drunk), and this is an everyday experience. It just isn't the big things, it permeates societies mores and taboos.
In South Africa the context, is obviously different. I would expect animosity between the English, and the Afrikaners (who, often to my knowledge, opperate similarly to the white populations in the Appalachia). I would expect animosity between the San, and Bantu peoples. But to deny the significance of institutionalized racism and white privilege seems deeply absurd to me given the difference in wealth, in education, in well everything between not only whites and blacks, but whites and other categories of people (coloured, Indians, and so on). This doesn't mean there is some secret cabal of white people planning the demise of the black population, or that no black people in America, or Canada, or South Africa have it good, it means in aggregate, black people have it worse, then white people, and society in general operates in such a manner, and has a history, that this empirically, through quantitative and qualitative true. None of this takes into account intersectionality--in the context of South Africa, this would take into account the new moneyed black political elites, and so on.
There is something to be said about not using this definition in the presence of working-class or poor white people who don't so obviously benefit from it (but they still do, but because of intersectionality, they are still an abused class, this time by the rich, instead of whites), but this wasn't just pulled out of the ether--it was used to describe the world as it is, and for my money is pretty much correct. The history of colonialism, till this day, has shaped the destinies of many people, and if you honestly think South Africa has gotten over apartheid in 20 years, but America some hasn't gotten over slavery in 200 I don't know what to tell you.
I got my information from South Africa here, and from a black South African professor (teaching a statistics in the social science class):
https://welections.w...n-south-africa/