SiFive Tapes Out First 5nm TSMC 32-bit RISC-V Chip with 7.2 Gbps HBM3
IIRC, 32-bit RISC-V is only intended for deep embedded workloads, with 64-bit for general purpose compute.  So a SoC w/ a single 32-bit core would seem to be a less-than-ideal fit for the cutting-edge 5nm process.