It will only say "processed", since this is mail through the USPS there is no verification of delivery available.
We estimate that it takes 2-3 business days to make it to the jail. Once there, the staff opens and reads each piece of mail and inspects it for contraband. Once they decide the mail is fit to be handed out at mail call, your inmate will receive it. Any delay that occurs at the facility is out of our control. We make no guarantees as to how long it will take as there are thousands of facilities and none of them do things the same way.
https://www.inmateaid.com/ask-the-inmate/will-the-status-of-my-letter-say-when-it-s-been-delivered-to-my-inmate#answer
Accepted Answer Date Created: October 20,2015