S2 : Finding out if the current setup i have (some old, some new) speakers support S2, and ramifications

Apologies if this has been answered elsewhere.

i’m a long time customer of Sonos, my enthusiasm tempered after the botched effort a few years back whereby the forced upgrade resulted in landfill-bound bricked speaker. Even though they reversed that, i was still left w/ a useless Play speaker that could no longer be used-i have to believe many of us lost faith after that -i still purchased and gifted new things like moves,etc. My current setup is a mix of possibly old and new (i’ve lost track what supports what) and i still experience that frustrating lag of sound pushing out to all speakers that feels like water from a hose that you’ve turned on and now wait for it to come out the other end:).

ok after that pre mumble, here’s my question:

How do i know that i am running the 12 or so speakers i have around the house on the latest, most performant software? What speakers don’t support S2  and if the don’t sould remove them? re group them? i totallly understand the need for hardware upgrades (we have to do this w/ PC’s) but looking for clear steps to setup a  mixed system for best results. 

Thank you for a response or referenced where this has been explained. also thanks for letting this old fan of sonos vent for what was clearly a painful episode in their history:).