It is a bit weird. As a Brit I would say that the first "home" has changed from a noun to a sort of adjective. It has the same type of meaning as fr example "bu

It is a bit weird. As a Brit I would say that the first "home" has changed from a noun to a sort of adjective. It has the same type of meaning as fr example "busy" or "asleep". We quite often say "Sally is home" and it has a similar logic to "Sally is busy" or "Sally is asleep".