Is the USB-C to Mini DisplayPort cable compatible with Thunderbolt 3 ports?

Yes, the USB-C to Mini DisplayPort cable works with Thunderbolt 3 ports and USB 3.1 Type-C ports that support DP Alt Mode.

What is the maximum resolution supported by the StarTech.com USB-C to Mini DisplayPort cable?

The maximum digital resolution supported by the StarTech.com USB-C to Mini DisplayPort cable is 3840x2160 at 60 Hz.

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StarTech.com CDP2MDPMM1MB 1m / 3.3ft USB-C to Mini DisplayPort Cable - 4K 60Hz - Black - USB 3.1 Type C to mDP Adapter (CDP2MDPMM1MB)

1 m / 3.3 ft. USB-C to Mini DisplayPort adapter and cable in one avoids the hassle of a bulky adapters for clutter free installation
USB 3.1 Type C to Mini DP adapter cable supports UHD resolutions up to 4K 60Hz
Mini DP adapter cable works with Thunderbolt 3 ports and USB 3.1 Type-C ports that support DP Alt Mode
Mini DP cable features reversible USB C port for hassle-free installation
Black 1 meter / 3.3 foot mDP adapter cable matches your black USBC Ultrabook or laptop