How to Connect iMac to Monitor | use external monitor as a second screen for iMac Pro - YouTube
Use an iMac as an External Monitor - YouTube
Bloomberg: New iMac with Pro Display XDR design coming this year, cheaper external display also planned - 9to5Mac
Want to use an iMac as an external monitor? You need an old version of macOS | Macworld
How to Calibrate Your Apple Mac Monitor (iMac, MacBook Air and Pro)
Incase anyone ever needs the answer…I have a 27” 2010 iMac working in Target Display Mode with a M1 MacBook Pro using a miniDP to USB C adaptor that's capable of 4k60Hz.
iMac Pro Works With Apple's New Pro Display XDR, But Limited to 5K Resolution - MacRumors