Defer loading of external javascripts, like google ads [wordpress]

tsw-defer-reg.php

<?php 
/**
 * Defer loading javascript for unregistered scripts (ads)
 * @uses $tag(string) The <script> tag for the enqueued script.
 * @uses $handle(string) The script's registered handle.
 * @uses $src(string) The script's source URL.
 * @see https://developer.wordpress.org/reference/hooks/script_loader_tag/
 */
/*function to add async and defer attributes*/
function colormag_child_add_defer_jstags( $tag, $handle ){
    wp_register_script('osd_listener', 
    'https://www.googletagservices.com/activeview/js/current/osd_listener.js', 
                        [], null, true);
    wp_register_script('abg_lite', 
    'https://tpc.googlesyndication.com/pagead/js/r20200610/r20110914/abg_lite.js', 
                        [], null, true);
    wp_register_script('qs_click_protection', 
    'https://tpc.googlesyndication.com/pagead/js/r20200610/r20110914/client/qs_click_protection.js', 
                        [], null, true);
                        wp_enqueue_script('osd_listener');
                        wp_enqueue_script('abg_lite');
                        wp_enqueue_script('qs_click_protection');
    ## 1: list of scripts to defer. (Edit with your script names)
    $defer_scripts = array(
        'osd_listener',
        'abg_lite',
        'qs_click_protection' 
        );

        foreach($defer_scripts as $defer_script) {
            if ($defer_script === $handle) {
               return str_replace(' src', ' defer="defer" src', $tag);
            }
         }
         return $tag;
} 
add_filter( 'script_loader_tag', 'colormag_child_add_defer_jstags', 10, 2 );
?>