Yes, I believe the blocking issues are all resolved. What's needed now is just some dedicated time from Boulder devs to go over the spec and implementation with a fine-toothed comb and make sure we're 100% correct there. Since CAA checking is part of our compliance duties, it's particularly important that we not get it wrong in any way. Apologies for letting the implementation drag out so long - it's something we'd still like to make happen.