The core is actually topped out, but the roof has not been made yet. You can see above that the scaffolding is being set up for the core, but the future parapet will be high above the topped core. So only the core is topped as of now, not the whole structure. Notice they took the concrete pump off of the core, and there is also an american flag on the very top of the core, reaching 528 feet
Top of Arthaus by
Philly SkyGuy, on Flickr