A signature-required order is - in theory - a good idea with any package that costs more than a few dollars. But it is understandable that some folks may not wish to see, and be seen by, the delivery person (for reasons of paranoia). So it is good that you make it optional for orders below a certain dollar amount.
I do not know which delivery company you use. But UPS (and probably others) will allow you to sign up to get SMS (aka "text") messages sent directly to your phone. Some of their shipping methods will show an update every time the packages goes through one of their distribution points, gets transferred to a different truck, reaches your local distribution/delivery center, gets placed on the final truck for delivery, and when the package is actually delivered. Other delivery methods might only have information about the latter. And other delivery companies... At one time, a person could get a package delivered by the US Postal Service and their website would still show it as being "in transit" for weeks, lol, so the level of information and accuracy varies. Still, for those companies that fully support it, the ability to get notification sent to your phone about deliveries is both reassuring and useful.
Speaking of phones, there is an app in the Google Play Store (for Android phones) called Package Buddy that will track packages from, IDK, close to 100 carriers that deliver in lots of different countries around the world. And some of the carriers, themselves, have their own apps (I know that UPS has one). The "Internet Age" has really been helpful for shipping/receiving packages. For example, with UPS' website (and directly from their cellphone app, too), the recipient can choose where the package gets left (front door, porch, side door, back door, neighbor's house, et cetera).