No, because they will stagger the downloads. It’s not explicitly stated, but it’s hinted at in the FAQ
[QUOTE=https://www.microsoft.com/en-us/windows/windows-10-faq] Between reservation and when your upgrade is ready, the files you need for the upgrade will be downloaded to your PC to make the final installation go more quickly. Then, when your upgrade is ready after July 29, 2015, you get a notification that lets you get started with your upgrade.
Can I get my free Windows 10 upgrade even if I didn’t reserve?**
Yes. The easiest way to get the free upgrade is to reserve, but you can upgrade even if you don’t reserve.
Once Windows 10 is available, we’ll begin notifying devices that their free upgrade is available. Just open the Get Windows 10 app to schedule your upgrade. Note: Some notifications will go out as soon as Windows 10 is available; others may go out in the weeks or months following.