Is this USB C cable compatible with Thunderbolt 3 ports?

Yes, the StarTech.com USB C to USB C cable is compatible with Thunderbolt 3 ports.

What is the maximum power output of the StarTech.com USB C to USB C cable?

The maximum power output of the StarTech.com USB C to USB C cable is up to 5 amps (100W).

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StarTech.com USB2C5C1M USB C To USB C Cable - 3 ft / 1m - USB-IF Certified - 5A PD - USB 2.0 - USB Type C Charging Cable - USB C Fast Charge Cable

Power USB Type-C devices
Provides up to 5 amps of power output for fast charging mobile devices or powering a USB-C laptop
Power your USBC laptop from a USB Type-C wall charger / car charger / power bank
Charge a USB Type-C laptop from a docking station
USB-IF Certified
Thunderbolt 3 port compatible
USB Type C Cable / USB C Charging Cable / USB C Fast Charge Cable / USB C PD Cable
1m / 1 m / 1meter / 1meter / 3.3 ft / 3.3ft / 3.3 foot / 3.3foot / 3.3 feet / 3.3feet / 3.3' / 3.3 '