gěi kèhù de jiéwěi kěyǐ duō yī jù wǒ huì zài xiàwǔ sì diǎn qián fā gēngxīn bǎn

给客户的结尾可以多一句：“我会在下午四点前发更新版。

You can add a sentence at the end to customers: 'I will send the updated version before 4 PM.'