Harry Potter and the Sorcerer's Stone

I am reading the first book in the Harry Potter series (Harry Potter and the Sorcerer's Stone) and understood that the book is writted in third-person omniscient and I know this because in the text they say things like..."It was on the corner of the street that he noticed the first sign of something peculiar-a cat reading a map. For a second, Mr. Dursley didn't realise what he had seen- then he jerked his head around to look again. There was a tabby cat standing on the corner of Privet Drive, but there wasn't a map in sight." In this little bit you can understand a little about what Mr. Dursley was thinking. Now there are more parts from the text..."He had been hugged by a complete stranger. He also thought he had been called a muggle, whatever that was." (again Mr. Dursley), "'No, thank you,' said Professor McGonagall coldly, as though she didn't think this was the moment for sherbet lemons." (Professor McGonagall), and there are more perspectives throughout the story, unfortunatley I am at the start of the book so I didn't get to read much about Harry yet.