I also have a 7 Pro and updated from 13 to 14 yesterday. When digging around in the settings it said my Google Play System was out of date, it downloaded and required a reboot. I checked again and it's still out of date but with a different update size. I did this a few times before realising it wasn't working. I'm on August 2023.
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It looks like it's just the deployment that isn't finished yet (probably depends on the geography too). My Google Play System is still at the August version.
EDIT: I just got the September update. So it indeed just needed time to propagate to all devices/geographies.
Edit: It is fixed now :)
Original post: I updated my Pixel 7 Pro to Android 14 yesterday. Today, I noticed that the Google Play system update for September (65MB) is available, but it fails to download. This issue was also present for updates in August or July, if I remember correctly. Google eventually resolved those issues, so for now, we'll have to wait for them to address this one.