Express a wish or hope; 'it would be nice if', 'I hope that'.
Long explanation:
The ~といいなあ grammar point is used to express a wish or hope for something to happen or to be in a certain way. It can be translated as 'it would be nice if' or 'I hope that' in English. The formation differs depending on whether it is used with a verb, い-adjective, な-adjective, or noun.