Many billions of RISC-V of CPUs have shipped, so, pedantically, that means they're already viable for including inside consumer devices. However as other replie

Many billions of RISC-V of CPUs have shipped, so, pedantically, that means they're already viable for including inside consumer devices. However as other replies have noted, you'll have to wait a number of years before they'll be used as the main CPU, rather than just some tiny core off on the side doing power management or whatever.