Heigh del emento más alto de un colección

jQuery( document ).ready(function() {
  var maxHeight = 0;

  jQuery('article.post-grid').each(function(){
     var thisH = jQuery(this).height();
     if (thisH > maxHeight) { maxHeight = thisH; }
  });
  console.log(maxHeight);
  jQuery('article.post-grid').css('min-height', maxHeight);
});