Different parts of the country will vary shipping times and even springs - as they sub-contract these to several regional spring shops. I have bought a lot of springs over the years from JCW and I have always had good luck with them. I don't remember ever waiting more than a week.
No leaf spring, but ordered many step bars for my trucks. Never have been disappointed in their delivery. Even had one set with a bent bracket, they sent me a new one and let me keep the bent one which I straightened and later used.
I have to add. Unless they have changed in the last year or so - do not get your rear spring shackles from JCW. They were sending out ones made in India and they were junk.