We’ll be using T(-) Countdown plugin

  1. Upon installation and activation of the plugin, a widget will then be available.
  2. Use the widget, T(-) Countdown, and set up the countdown desired.
  3. We’ll use the Woocommerce Hook to add the countdown to the product page. Add the ff. to functions.php.
    //woocommerce hook which adds the function called to the single product summary 
    add_action( 'woocommerce_single_product_summary', 'delivery', 50 );
    
    function delivery() { ?>
    //calls the id of the widget used for the countdown
    <?php dynamic_sidebar('product-countdown'); ?>
    <?php }
    
  4. That’s it! Have fun with its design.

Screenshot-elite2

Reference
Elite