Expiry for Completed Usmles ?

Hi, I am an IMG applying for the 2025 match. I passed step 1 in 2023, step 2 in 2024, and recently step 3.

I am having difficulty finding information about the expiry/ validity timeline of these exams.

If I don’t match/ do residency in another country, will I ever need to write these exams again to practice in the US (fellowship) ?

Thanks !