My two iMac 27's use the Apple M1 chip

The title of your post ("My two iMac 27's use the Apple M1 chip") is misleading. All of the 27" iMacs that Apple ever released had Intel chips. The Late 2009 through Late 2013 ones had 2560x1440 pixel displays. Later ones had 5K (5120x2880 pixel) displays.

Apple now has a standalone 27" 5K Studio Display that is very similar to the built-in displays of 27" 5K Retina iMacs.

Studio Display - Apple

John Galt wrote:

We don't know what Apple is planning to do.

Last November, an Apple representative confirmed that Apple had no plans to release an Apple Silicon version of the 27-inch iMac. Apple was encouraging buyers to pair a 27" 5K Studio Display with a Mac mini or Mac Studio.

The Verge (November 6, 2023) – Apple has no plans to make a 27-inch iMac with Apple Silicon

Of course, Apple could have changed their minds since then, without announcing their change of heart. We have no way of knowing, one way or the other.

As the two previous posts noted, there are no 27" Apple Silicon iMacs.

iMac 24″, macOS 13.6

The device that you selected when posting indicates that your M1 (2021) or M3 (2023) iMac model has a 24" screen (not 27").

There are third party 5K displays at fraction of the cost, get a Mac Mini and buy the Samsung 4K display which frequently comes on sale and you will save a bundle.

And for some strange reason some seem to think that the iMac27 had used Intel stating things like Apple wasn't going to migrate their M-series silicon to the iMac27.

We don't know what Apple is planning to do.

I'm more interested in what she did not say.