Unable to retrieve Height from a toggleClass jQuery

I want to get the height of a class that is toggled. When a button is clicked, the class .category-menu-visible is added. If the class exists, then I want to get it's height. But when I alert menuHeight, it is 0.

Small scale JSFiddle example

Actual Code:

jQuery

jQuery('.topics-btn').click(function(){
  jQuery('.category-menu-wrap').toggleClass('category-menu-visible');

  if (jQuery('.category-menu-wrap').hasClass('category-menu-visible')){
    var menuHeight = jQuery('.category-menu-visible').height();
    alert(menuHeight);
    jQuery('.sidebar .content-wrap').css('margin-top', menuHeight);
  } else {
    jQuery('.sidebar .content-wrap').css('margin-top', 0);
  }

});

CSS:

.category-menu-wrap {
  width:100%;
  height:0px;
  background-color:#F7D5B6;
  overflow: hidden;
  transition: height .5s cubic-bezier(.27,1.76,.95,1.19);
}
.category-menu-visible {
  height: 70px;
  transition: height .3s cubic-bezier(.27,1.76,.95,1.1);
}

Why can't it retrieve the height?