Pegasus3 can charge your computer.
Pegasus 3 is shipped with an active thunderbolt 3 cable. When Pegasus3 is connected to your Mac computer, it will charge at 15w.
It charges at standard 15W.
Thunderbolt 3 is the certified cable and 15w is the standard specification. This level of charging capacity is safer with minimum risk to your computer.
It stops charging when the adaptor is plugged in.
When charging adapter is plugged in Mac computer, your Mac will determine to use the power adapter, and Pegasus stop charging.