How to set the time zone?
To work time and date properly with your time you need to settings restrofood plugin timezone from restrofood settings and WP admin settings -> general
Restrofood settings option:

WP admin settings option:

To use pre order system you need to set some settings from restrofood delivery settings. Please follow the screenshot. After set all settings you will find the date and time select option in checkout page How to hide delivery date and time from checkout page?
Go to Appearance -> Themes -> Add New -> Upload Theme -> Browse and Install Now You will need to install some required plugins to work the theme properly. Follow the below screenshot.
To create product attributes follow the screenshot: Set Product Variations:
Email notification work on order status. When admin change order status mail automatic send to customer to inform their order current status. Admin ON | OFF the mail notification option from the settings page. Also, the admin can change notification text based on status, Subject text, and mail template header, footer text, and header background…
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