Yes, the refunds are available up until you receive a notice from Glowforge asking if you are ready to accept delivery and provide a shipping address.
A revised schedule was included in the email that went out on June 7th. If you didn’t receive a copy, you can read it here:
It also has instructions on how to cancel your order if you decide you can’t wait any longer at the bottom of the email.
I know the Glowforge team feels really bad about the delays, but since there isn’t anything more they can do about it, the decision as to what is right for each individual has to be up to that individual. Good luck making your decision.