First of all, congrats on quitting your career to go full time on your business!
. I know that's scary (I have done it also lol), but it's incredibly rewarding, despite all the work.
Have you considered using a fulfillment company to help out (would depend on how many orders you are expecting)? You could also hire someone part time to help you with fulfillment, bring on an intern, or work late nights.
Well, I would specify this fact in your campaign (estimated time of delivery for rewards). Be as transparent as possible. That is a good amount of time lag, but there are ways you could get around that, it seems like it would just not be ideal with your schedule.