Chia mining is a failure and not profitable compare to mining ETH or other coins, it costs more to invest on 100terabytyes of space (HDD or SSD) than to buy few RX580 and start mining Ethereum, you will make more profits this way than buying HDD or SSD
Before switching to POS 
POS is thought to be going live on January 2022 but as we all know and as it always happened before it will be extended to the end of the 2023 more likely so there is plenty of time to keep mining Ethereum and even if this happens those cards can mine Ravencoin easily.Burning money on CHIA is the biggest mistake anyone can make right now where all other coins are profitable to mine with GPU-s and you go and start mining with HDD-s.