You can know if your UPS package is on the way by going UPS website and using their tracking page.
The UPS tracking link is at
https://www.ups.com/track?loc=en_US&requester=ST/
Simply enter your tracking number for the UPS package and it will show where it's located at and when it should be delivered.
UPS will leave a package by your door or at your place without a signature if it doesn't require a signature.
UPS requires a signature for packages that contain adult items or high value items such as computers, Jewelry etc if the sender of the package requests a signature.
UPS itself is not the one that requires the signature on certain packages but the sender of the package requests a signature required if the product is an adult only product or is a high value item to ensure the correct person gets the package.
UPS does leave your packages at your door unless the package requires a signature.
The majority of packages that UPS delivers do not require a signature and can be left at your door on your porch or somewhere else safe.
If the UPS package does not require a signature the UPS driver will bring the package to your door and leave it near your door or behind something on your porch.
I've had UPS packages left behind a chair I had on my porch where the UPS driver used the chair to hide the package behind it.
That was a good idea to me as it prevents someone from seeing the package and stealing it.
If there's nothing to hide it behind the UPS driver will simply leave the package in front of your door or near your door.
If the UPS driver needs you to sign for the package they will knock on the door or ring the doorbell if you have one and if you don't respond they will leave a note and door tag stating that they were at your house and need a signature and will be back.
You can often sign the door tag with your signature and UPS will sometimes leave the package but if it requires an adult signature the UPS driver will want you to sign their device in front of them.