Orders Ready-for-Pickup

[Bitzu]

Hello everyone, 

For the past few days, I've been trying to figure out how do I know if an order is ready-for-pickup.

Let's consider I create an order then I mark it as ready-for-pickup.

Using the Shopify API, I get all orders, but there doesn't seem to be a difference between an unfulfilled order and the one I marked as ready-for-pickup

Please help. Thank you.