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In terms of technology, yes. However, AT&T is currently blocking 5G on a lot of unlocked devices because they want you to buy their branded devices. There's a "Service Capabilities Unlocked Devices" list on their website that lists which unlocked devices they'll allow to use 5G. Those are basically the iPhone 12, the newest Galaxy devices (mostly the S20 and S21 versions), and the Pixel 5G devices. Otherwise, they're blocking a lot of devices from using 5G despite the device's ability to do it. This will likely change in the future, but really, right now 5G isn't awesome in most places anyway as the network is still evolving.
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