You can easily schedule lights to turn on and off with any light which is controlled by SmartThings. So it’s just a question of selecting the right light.
You said you have two switches – – do they both control the same light? Or are they controlling different lights?
If they are both controlling the same light, then in the US that is called a “three-way” set up. A common example would be the lights over the basement stairs. You might have one switch at the top of the stairs and another switch at the bottom of the stairs which both control the same light. 
Three ways work a little differently with networked switches then they do with non-networked switches. One switch, the one that actually controls the current load to the light, Will be the master. The other switch will be the auxiliary, which GE calls an “add on.”
When you flip the add on switch it sends a message to the master and the Master actually controls the current to the light. The following FAQ explains more about that.
As others have mentioned, the specific device you linked to is an add on switch, which is why the product description says “not a standalone switch.” But that’s fine as long as both of your switches control the same light and the other switch is a master switch.
If by chance you bought two add-ons by mistake, you just need to return one of them and instead get a matching master switch for the master position.
However, if your two light switches control two different lights then you need to have two master switches, one for each light.
There is an excellent FAQ on wiring GE switches which should help a lot once you get the correct devices: