The new Type-C ports on Apples latest ranges of Mac laptops speak BOTH Thunderbolt and USB protocols, and therefore both the AT2020USB+ and the AT2020USBi would work in both the Thunderbolt 3 port and the USB-C ports. However, you would need to purchase an adapter as the cable that comes with the microphone is USB A.
An example of the adapter that you would need, and that we would recommend can be purchased directly from Apple here.
We hope this article solves your enquiry. However, if you have any other questions about the above products or any others in our range please do get in touch.