List of End of Life/End of Support (EOL/EOS) dates?

I checked the EOS status of my modem and it shows it as no longer being supported by xfinity (not surprising as it's 10 years old).  The site provides a list of compatible, supportable modems that I could choose to buy. However, before I go and buy a newer modem from the list, I would like to know what the EOS date is for these currently supported modems - the reason is that I don't want to spend $$ on a new modem only to find out that xfinity could stop supporting it soon after I buy it.  Do you have these available so that I can make an informed purchase?

Thanks