As far as the written, formal language is concerned, English really has only three dialects: US American, Canadian, and everywhere else. There are some other subtle differences (such as "robots" for traffic lights in South Africa, or "minerals" for fizzy drinks in Ireland¹), but that's pretty much it.
¹ Yes, this isn't just slang in Ireland: the formal, pre-recorded announcements on trains use it: "A trolley service will operate to your seat, serving tea, coffee, minerals and snacks." The corresponding Irish announcement renders it mianraí. Food service on trains stopped during covid and has not yet resumed, so I'm working from distant memory now.