CHERI-RISC-V is being standardised [1], Codasip is working on a commercial implementation of CHERI-RISC-V [2], and lowRISC is working on the Sonata project [3] implementing CHERIoT.
The Early performance results from the prototype Morello microarchitecture report [4] predicts the overhead between 1.8% and 3.0%. We don’t know what that overhead would be in production until such a commercial implementation is delivered but we have enough evidence it is worth the effort with the current estimates and given that CHERI can deterministically prevent around 2/3 of memory-safety-related vulnerabilities [5], not to mention benefits of mitigating future unknown vulnerabilities with compartmentalisation.