In reply to Ridge:
I resisted updating my iPad until last Monday - there hadn't been any dire threats regarding iCloud keychain. There are some notices about "a new device" which I like, it suggests that the device ecosystem isn't the horror show of security risks that one would intuitively think it to be.
This should help:
https://support.apple.com/en-us/HT204085
Do I find it useful? I'm not sure - I only use my iPad for reading, Google Earth and looking things up on Wikipedia and occasional email. I mostly use a laptop for heavy lifting as I don't find tablets that useful (although, as an experiment, I used on for r a 2-day review meeting about 5 years ago where I was doing a fair bit of typing and it seemed OK-ish. But I digress...
The cloud backed up photos are presumably attached to a yourname@mac, me, whatever.com account? So you can check these on a browser [which I just did and it promptly emailed me a notification that my iCloud account had been accessed by a web browser. Which, as I say, I like]