Hello Dylan, welcome, we are hopeful, but tbh i'm not expecting it in the UK today. Only 3 hours left!
sorry to hear that, I called Apple Support (which took an hour), the lady said that the servers are over jammed, and everyone needs to stay of itunes for a few ours to cool down.
Once cooled, the update can be sent out (finally), and hopefully we'll have it by 5 PM EST.
best of luck.