If you're a company making your own SoCs already and want a high performance RISC-V core for a mid-range tablet or phone or an SBC equivalent to the Raspberry P

If you're a company making your own SoCs already and want a high performance RISC-V core for a mid-range tablet or phone or an SBC equivalent to the Raspberry Pi 4 or something like that then the answer is "now". If you're someone wanting to buy a quantity one chip from Digikey or Mouser then it'll be ... when someone decides to make and sell a retail chip. Which might well be someone making their own chip for a tablet or set-top box etc and selling the surplus production.