Hi Mimi

I found this list of computers with the Apple T2 Security Chip - 
https://support.apple.com/en-us/HT208862, but not a list that
correlates them to the system ID.  With this update, is this the entire
list?

As per the link you sent me, the following are the system IDs of the T2 Macs mentioned in the list

1. iMac (Retina 5K, 27-inch, 2020) - iMac20,1, iMac20,2
2. iMac Pro - iMacPro1,1
3. Mac Pro (2019) - MacPro7,1
4. Mac Pro (Rack, 2019) - MacPro7,1
5. Mac mini (2018) - Macmini8,1
6. MacBook Air (Retina, 13-inch, 2020) - MacBookAir9,1
7. MacBook Air (Retina, 13-inch, 2019) - MacBookAir8,2
8. MacBook Air (Retina, 13-inch, 2018) - MacBookAir8,1
9. MacBook Pro (13-inch, 2020, Two Thunderbolt 3 ports) - MacBookPro16,3
10. MacBook Pro (13-inch, 2020, Four Thunderbolt 3 ports) - MacBookPro16,2
11. MacBook Pro (16-inch, 2019) - MacBookPro16,1, MacBookPro16,4
12. MacBook Pro (13-inch, 2019, Two Thunderbolt 3 ports) - MacBookPro15,4
13. MacBook Pro (15-inch, 2019) - MacBookPro15,1, MacBookPro15,3
14. MacBook Pro (13-inch, 2019, Four Thunderbolt 3 ports) - MacBookPro15,2
15. MacBook Pro (15-inch, 2018) - MacBookPro15,1
16. MacBook Pro (13-inch, 2018, Four Thunderbolt 3 ports) - MacBookPro15,2

The system IDs of the Macs can be seen from official Apple’s documentation form the links below :-

https://support.apple.com/en-in/HT201634 - For iMac
https://support.apple.com/en-in/HT202888 - For Mac Pro
https://support.apple.com/en-in/HT201894 - For Mac mini
https://support.apple.com/en-in/HT201862 - For MacBook Air
https://support.apple.com/en-in/HT201300 - For MacBook Pro

After cross-checking only iMacPro1,1 seems to be missing.

Thanks
Aditya