When your theme snippets are installed for the pro tier, Product Customizer will display pricing changes on the product page.

For options that have a price for "completion" (single-line text, paragraph text, file upload), the price for entering the option will be displayed next to the label.

For options that have a price for a "choice" (dropdowns), the price is displayed next to the choice to which it relates.

A "Customizations" total is displayed on the product page below these options.