[b]...it may already be on Apple's antiquated list.... To paraphrase a song from my youth, ...this old mac ia s gettin' ready to meet the saints.]
That particular iMac had a long production run: 6-2017 to 10-2021, so it's still "Supported," and will be for, I believe, another 3 1/2 years.
Rosemary Clooney!
(She recorded version with which I'm familiar, anyhow.) I've always liked that song, and despite the fact that I haven't heard it since the '50s, I still find myself singing it from time to time.
