B (non EU) permit process post acceptance

Hello

My employer received a letter confirming I have been granted a non-EU B permit to work in Geneva. I have not received any communication directly (just forwarded from my employer) and I can't get hold of the OCPM. Does anyone know the next stage(s) of the process? I'm form the UK so I don't need a visa to visit/move. I'm due to move next weekend and start work a week Monday!

May I ask how long the process took in total? from employer applying for the permit to its approval?