Run callback after Views exposed filter AJAX
JS events need to be bound when the document is ready. Drupal handles this for you if you use behaviors:

(function ($) {
  Drupal.behaviors.myModule = {
    attach: function(context, settings) {
      $(document).once('mymodule-ajax').ajaxComplete(function (e, xhr, settings) {
      // ...
      });  
    }
  }
})(jQuery);