Don't recall seeing any comments about this so far... but the Chelsea FC website says that from 1st January 2022, for domestic matches the whole of The Shed (upper and lower) will be a safe standing area. Happy days!
https://www.chelseafc.com/en/tickets---membership/buy-tickets?pageTab=MEN'S FIXTURES scroll down to Argyle and click "View Full Ticket Information"
https://www.chelseafc.com/en/tickets---membership/buy-tickets?pageTab=MEN'S FIXTURES scroll down to Argyle and click "View Full Ticket Information"