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First of all, there's nothing special about USB mics in terms of picking up ambient noise. Two main types of mics are dynamic and condensers, and there are models with USB-connectivity of both those types.

Secondly, hearing typing when someone types is ok, so please don't treat it as a problem in itself. Obnoxious noise level is a problem, which can be solved by increasing SNR: bringing the mic closer to the sound source, swapping a mic for another transducer type or another polar pattern, putting some kind of dampening on the line of sight between the mic and the noise source.

I've written a guide for voice recording which covers most of the basics. Hope you'll find it helpful: https://indiscipline.github.io/post/voice-sound-reference/