when i can contact with the customer service in chat

Their Support hours during weekdays starts at 6 AM to 6 PM PT. While on Saturdays, they operate from 6 AM until 3 PM PT. Any specific concern?

I can help you with reaching out to our live customer support through chat, @Ahmed Mohamed1.

Can you tell us more about the concern you're having right now? I'll surely get back to you with the best solution as soon as possible. 

Our Customer Support for QuickBooks Desktop (QBDT) Pro and Premier is available Monday to Friday from 6:00 AM to 6:00 PM (PST). For QBDT Enterprise, you can reach out anytime at any day.

Follow the steps below on how to reach them: 

1. From your QuickBooks Desktop account, click the Help menu at the top.
2. Select QuickBooks Desktop Help.
3. Provide some information about this concern on the search box.
4. Click the Contact Us link at the bottom of the window.
5. You'll now be provided with a few support options.

You can check this article for more information about the different types of support we offer and their availability: Contact QuickBooks Desktop support.

Here are some articles that can help you with using QuickBooks Desktop (QBDT): Related help.

Please know that you can always drop by here if you need any help with your account. I will be happy to assist you further. Have a wonderful day!