How to count how many photos you have in Google Photos

I'm in the process of copying all my photos from over the years to Google Photos. They currently reside in Apple Photos, which reports exactly how many photos I have. But this seems to be a feature missing from Google Photos. I'm using the Google Photos Backup utility to upload all the photos, and it reports a count. But to be extra confident I'd like to see a count of how many are actually in Google Photos now. This article is about how I was able to get a count of photos from Google Photos.