这句话的意思是：请发给我尾款的金额和订单货物就绪的日期.
你可以回复:
Hi xxxx,
Thanks for your email.Please be noted that the amount for the balance is xxxxx,and the readiness date for the order is xxxxx.
Please kindly advise whether we need to issue you the invoice for the balance amount.
Thanks & Best Regards,
感谢您的邮件.请注意尾款的金额是：xxxx,贵公司订单货物就绪日期是xxxx.
请告知我公司是否要向贵公司开出尾款金额的发票.