The USPS is putting the program back into the Disney Vault tomorrow, so if you need covid tests and you're not already caught up on the freebies, now's the time to order.
They released a batch back in September and a second drop back in November. If you don't remember whether you ordered both, place an order anyway—it'll immediately reject it if you're caught up, and if it doesn't do that, then you had at least one waiting for you and you just claimed it.