如何向客户催余款，船马上要到港了

您好，以下是一些催款的英语表达：

1. Could you please provide an update on the payment status for the invoice? The shipment is scheduled to arrive at the port soon and we need to ensure that the remaining balance is settled before the release of the goods.

请问货款已经付清了吗？我们的货物即将抵达港口，所以在货物放行前，我们需要确保余款已经清算。

2. I wanted to follow up on the remaining balance for the shipment. The goods are arriving at the port soon and we need to have the payment settled as soon as possible.

我想请问一下关于货物余款的进展情况。货物即将到达港口，因此我们需要尽快完结货款。

3. We would appreciate it if you could update us on the payment for the invoice. The shipment is expected to arrive soon and we need to ensure that all outstanding payments are settled before we can release the goods.

如果您能及时更新一下对于发票的货款，我们将不胜感激。货物预计到达时间即将到来，因此我们需要在货物放行前确保货款已经清算。

I hope this helps!