The updates for the A5 (2017) and A7 (2017) are not out yet, even though they received Wi-Fi certifications before the A3 (2017) did.
Back to the update in question. It’s currently rolling out in Russia (has been for a couple of days, actually). It bears a firmware version A320FXXU2BQG5 and includes the July 2017 Android security update.
We are guessing this is sort of a soak test and if all goes smoothly, wider availability should follow in a weak or two….