Good morning, I was prompted by the notification center that Mojave was ready to install. I saved and closed everything, and I keep back up of important files online. I went to restart to install on Friday morning and I've been stuck on this screen ever since. It is now Monday. What am I supposed to do? In the past when I've updated it's taken overnight but never several days. It's a MacBook pro I'm not sure what year but I've had it since 2015.