Yes everything turned out well for us!
I just checked my timeline, and it took about 6 days for my status to change from "ready" to "AP", and then the following day it changed to "approved" and then "issued" the same day. It took an additional day to ship and another to be delivered, but it could take longer depending on where you live in the UK.
I wouldn't worry much about it just because it's still on "ready for interview". I believe I read somewhere that USCIS doesn't show "processing" anymore for some reason. It just goes directly from "ready" to "AP".
Also, once your wife gets her visa and pays the USCIS fee, make sure to save the IOE number as you'll be able to use it to track her GC online