With this USB-C to Lightning cable, you can directly connect your iPhone, iPad or iPod Touch on your Mac for syncing and charging purpose.
You don’t need any Thunderbolt 3 (USB-C) or any extra dongle to connect your device. This cable helps you a lot. Along with that you can this cable with your Apple 29W, 61W, or 87W USB-C Power Adapter to charge your iOS devices.
Likewise, if you want to save some money, here’s an alternative on Amazon. You can buy USB-C to Lightning cable at $7.99 only.