I live in country Victoria and often buy pickup items from Sydney and Melbourne (pick up during school holidays).  I always message the sellers first and give them a range of dates that I will be in their city so they can okay a pickup during my stay at a time that suits them.  Some sellers want things 'gone' quickly and I don't end up bidding or buying.

Your item ended this morning and the buyer emailled you.  I wouldn't read anything into the fact that he hasn't answered yet.  After all, it hasn't even been a day yet.

Also, don't offer COD on your listings as COD is a service offered by Australia Post.  COD means you post the item to the buyer without having received payment and the buyer pays Australia Post when they collect it from Australia Post.  You pay a fee to Australia Post for this service, and Australia Post send you a money order for the payment.  You need to choose Cash On Pickup instead.