We can simple use a plugin for it. YITH WooCommerce Catalog Mode can do the work.
Although this might not be enough if you want to remove prices from Google results.
Add the following to your functions.php located at your theme page.
add_filter( 'woocommerce_structured_data_product_offer', '__return_empty_array' );
Test your page results according to Google at
Google Support – About sale price annotations
Google Merchant Center