In 'geography' in DS' reception year they had a look at our village, what it is called, and what kind of buildings there are - the garage down the road from school, the post office, the supermarket, the train station, the church, the park, .... They had a little school trip down the road to the church, and observed the various buildings they saw on the way.
If your child has an interest, and has developed an 'expertise' in a certain area, it will take a long time for them to be taught anything in that area at school, that they don't know already. Might be you have to wait until secondary.
On the other hand, a good reception class is very open-ended. Children will be taught the very basics only, but there should be resources and lots of opportunities and support for children to follow their own interests as far as they feel like going. The teaching is limited, but the learning shouldn't be.
Also, my friend's DS who has autism is being helped in reception by using his obsessions to engage him when learning other things. Reading and maths are shown to him in the context of his interests.