在测试环境中create po 后 返回有ESD日期的json 。请问如下图JSON如何清楚地识别和了解哪些数量是已经交付，哪些未交付. 已经交付和未交付有哪些区别，可否可以提供一些参考信息。
schedules: [{
"requestedQuantity": 20000,
"requestedDeliveryDate": "2025-07-30",
"confirmations": [{
"tiScheduleLineNumber": "0002",
"scheduledQuantity": 20000,
"estimatedShipDate": "2025-10-13",
"estimatedDeliveryDate": "2025-10-13",
"estimatedDeliveryDateStatus": "Confirmed",
"shippedQuantity": 0,
"customerRequestedShipDate": "2025-07-21"
},
{
"requestedQuantity": 20000,
"requestedDeliveryDate": "2025-08-01",
"confirmations": [{
"tiScheduleLineNumber": "0002",
"scheduledQuantity": 20000,
"estimatedShipDate": "2025-10-14",
"estimatedDeliveryDate": "2025-10-14",
"estimatedDeliveryDateStatus": "Confirmed",
"shippedQuantity": 0,
"customerRequestedShipDate": "2025-07-22"
}]
}
]
