Hello there, nonyanon.

In QuickBooks Online, the time tracking feature is only used for either employees or vendors. You can check this article for more information: How to turn on and set up time tracking.

You can also search for a third-party application that has similar functionality by clicking Apps on the left navigation menu of your QuickBooks Online account.

Please let me know in the comments if you have any additional questions or other concerns. Take care and t stay safe.