How to setup icons for WooCommerce statuses on the CheckoutWC thank you page.

custom-order-status-icons.php

<?php
// Do NOT include the opening php tag.
// Place in your theme's functions.php file

// Default WooCommerce order statuses
// - pending
// - processing
// - on-hold
// - completed
// - cancelled
// - refunded
// - failed
add_filter( 'cfw_thank_you_status_icon_pending', 'my_pending_icon' );

function my_pending_icon( $icon ) {
  $icon = 'fa fa-check';
  
  return $icon;
}

// You can copy and modify the above example for each status you would like to define