Payments are placed on hold for a security measure both for your account and for your buyer.
As you are a new seller, eBay have none of your selling history, so they need to see that a paid for item, will be shipped and delivered to the buyer. If you have tracking showing delivery, this will speed up that payout, and it is sent to your bank usually within a few days.
This has to be in place otherwise anyone could come on eBay sell expensive items, take the money and not post out the item. Once you are established as a good seller posting out items promptly, this hold stops, and you can select a daily or weekly payout from your sales.
