Not all Thunderbolt 3 systems support charging via their Thunderbolt 3 port. But for systems that do support charging via Thunderbolt 3, yes, the dock can provide up to 60W of power to charge the host system.
In order for the system to charge, the system must be connected to the Thunderbolt 3 port on the back of the dock with the small ‘Computer’ icon above it. This port can provide up to 60W of power to charge the host system.
If your system is able to be charged via Thunderbolt 3 and is not charging, please ensure you have the system connected to the proper port within the dock.