You can wait until Microsoft send it to you, but note that Windows 10 version 1703 is already available for download using MSDN subscription, Volume Licensing Service Center (for Volume License customers), and there is 90-day trial of Windows 10 Enterprise to version 1703. Keep in mind that the trial shouldn't be install on production machines.
Version 1703 isn't available via Update Assistant or Media Creation Tool, because it's a version only available through channels mentioned above.
Also remember that version 1703 is also available through Windows Update, but the rollout is throttled/staggered, which means that not every PC sees it at the same time. It'll just take time.