It is not displayed on the reading page in question. One would have to go to the source journal (on a day view if necessary) or view the entry in ?nohtml=1, or (temporarily?) disable the feature in the style to see it. The cut text is similarly not visible if someone's using the existing feature to turn off cuts on their reading page.

You can see how it treats an entry with multiple cuts and more than 4500 characters outside the cut in action temporarily here, until it scrolls off the page: http://exor674.dreamwidth.org/read#entry-6389107