While not a direct answer to see progress of AP image downloads, you may want to check into Efficient Image Upgrade for FlexConnect APs. It's been available since Gibraltar - 16.10.1. It downloads the new image to the master AP at the site then the o...
Interesting to note is Cisco shows that "It should also be resolved in the 16.3.6 and later builds" - we are running 16.3.7 and the bug was present on at least one 3650.
