Software Updates for a late 2015 iMac running Monterey 12.7.6
Is a late 2015 iMac running Monterey 12.7.6 eligible for software updates or security updates at least?
iMac 27″, macOS 12.7
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Monterey 12.7.6 is the latest possible version for a late 2015 iMac.
The 12.7.6 security release was released on July 29, 2024 and there haven't been any since then. See: Apple security releases - Apple Support
Also see the following from Identify your iMac model - Apple Support
iMac (Retina 5K, 27-inch, Late 2015)
Model Identifier: iMac17,1
Part Numbers: MK462xx/A, MK472xx/A, MK482xx/A
Newest compatible operating system: macOS Monterey