Hey,
If you purchase the Cubase Artist download version in the Steinberg Online shop, you will receive a Cubase Pro license. You don’t have to worry about the USB eLicenser arriving late.
If you purchase a boxed version at your local retailer, you need to activate it until July 28, 2020 in order to get Cubase Pro. But in that case you already have the USB eLicenser included in the box.
Just if you have purchased a Cubase Artist box at an online retailer you have to make sure that the box arrives until July 28, 2020 in order to activate it in time.
Best regards,
Matthias