If your website is built in Wix, you will need to use an alternate code to enable dynamic number insertion. With any kind of dynamic number insertion, you will need to have a target number configured in your account. Follow the directions here to configure a target number before beginning with the Wix setup.
Running the CTM script on a Wix site requires a connected domain (not available on free plans).
The 3000 value means that there is a delay of 3 seconds before the code will run. You may be able to shorten this value. It is recommended to run some tests to ensure the delay you have entered is working correctly.
Make sure to choose to add code to all pages and select Load code on each new page.
Select to place the code in the Body – end section.