Relax, thanks to @cytrinox, basically have working code now. I have already been able to edit some CR3 raw files from my Canon M50 with a special dev build. The code is going through technical review now.
Whether it makes it into the next stable release or not, I cannot say. There could be some challenges around packaging and availability of the required exiv2 setup in the linux distros (I think exiv2 team may be making an official release of 0.27.4 in the next week or so?). So, I guess darktable team will review where we are at closer to the freeze and make a decision then.