You could make your binding now and put in a ziplock Baggie...store it with the quilt until you are ready to quilt it. You have the quilt size and already know what the length needed will be. I do this with all my quilts since the fabric is already out (unless I use the scraps from backing trim after LA)...and that way I'm ready for when it's returned from LA....but, of course, I quilt mine right away...
Unlike you UFOr's...lol!,