The only way to check is to check the tread. If you’ve got a penny, use it:
https://www.bridgestonetire.com/learn/maintenance/how-to-check-your-tire-tread-penny-test/
Alternatively, you can buy a measuring tool on Amazon or stop into any tire shop and they’ll measure it for you. This is one of the things you should absolutely be on the lookout for. Lucid also measures it at each service.
2/32” is the legal limit, but I’d find tires and replace at 4/32” on a car that has the weight and power of the Air.
TireRack will help you find tires, and will list the OEM options as well.
Discount Tire / America’s Tire is also fantastic, and can be slightly cheaper than TireRack, and if you want you can buy their certificates as “tire insurance” against road hazards. But note: you do not need to buy the tires from them to get their certificates; you can just show up, they’ll inspect and sell you certs.