If you haven’t already ordered it, you can get it immediately as a downloadable .pdf file about 4 items below the one that you ordered (for R66) on that same site. If you have something to read it with (smart phone, tablet, etc.) you can take it with you wherever you go and read it in pieces. But then some people (myself included) appreciate picking up a real book and going through the pages. Just thought I’d point that out in case you’d missed it and were interested.