I just tried it and the option comes up for me.  I am on the east coast so not sure if that makes a difference time-wise or not.

Welcome to the QuickBooks Community, @nivbenhaim64. 

I'll be glad to assist in sorting out your issue about a callback request.

Let's proceed with these steps:

1. Restart your browser.
2. Use other browser like Incognito.
3. Clear your browser’s cache and browsing history.

Additionally, I’ve got you this article that’ll assist you more in troubleshooting your browser.

If you run into any trouble along the way, let me know. I'm always here to help you.

Have a nice day!

This feature provides customers with only available time choices if their original scheduled callback request time is not an option.