Tyre models that are marketed in the US must have a tread wear rating as part of the Uniform Tire Quality Grading system (UTQG) operated by the US government's National Highway Traffic Safety Administration. If the same tyre is available here you can use the information too – it's printed on the tyre sidewall.
Under the system, a tyre's tread wear is measured under controlled conditions involving an 11,500km drive on a specified test course, and compared with a "standard" tyre with a rating of 100. For example, a rating of 200 indicates that the tyre should last twice as long as the standard model. So, the higher the number, the longer you should expect a tyre to last.
This rating is purely comparative. Real-life wear of a tyre depends on a number of aspects, such as the road surface, tyre pressure, wheel alignment and driving style. A tread wear warranty is a more reliable indicator of the life of the tyre.