That was my thinking too
Yes you're right, but if I don't get the reg No. 'till Friday, I won't get the insurance docs done and back to get the tax sorted out on the same day. There's going to be a short delay (a day or two) at least.
You get the reg Friday, phone your insurance up, they get docs to you on saturday morning and then you make sure you get to tax it by 12 on the saturday at post office. My insurance company always gets docs to me next day!