Is herd immunity even a useful concept in relation to this virus if that’s the case?
Yes in a sense that you can restrict infections temporarily until a vaccination is found or reduce the over all numbers to effect the number of deaths.
What the health officials are attempting to do is contain the majority of infections, which from my personal opinion is pretty hard, based upon how the virus transfers .
The best way to block this virus to transfer to yourself is to restrict being public as much as possible and wash carefully after you do..