Expiry date for item purchased

Hi there,

I´m Veterinarian from Colombia currently pursuing a Ph.D. in infectious diseases at the University of Georgia. I´m interested in purchasing your NIW DIY package along with the review service. However, I wanted to know if there was an expiry date for the review service or for DIY package. If so, would it be better if I wait until I´m ready to start writing the I-140 file?

Also, something that I´m still not clear about is when would my wife get the green card if I apply following the EB2-NIW route and am successful?

Thanks a lot!