...behind but are getting caught up, sometimes it takes longer then anticipated..
...orders keep flowing in and we are working to get them done as fast as we can....
If I may, a suggestion based on my experience working at a small mfg'er of a unique product, but the place suffered from angry customers. As the front office worker, I took the brunt of the complaints, and sided with the customers over a very simple matter that the boss could have easily recognized if only he understood the true value of his products vs the time it took to make them.
What I did to mitigate the problem was a risky solution that kept the customers reasonably pleased. When the boss told them their product would be available for pick-up in two weeks, I found a way to contact them privately and assure them in the most honest and realistic manner that their product would more likely be available in six weeks. More often than not, they received their products in the span of time I told them, and were pleased to get what they ordered in four to five weeks. They appreciated my honesty about our work capacity and were baffled as to why the boss - who had managed the place for the past 20 years - didn't understand his production limitations, yet a 2-year computer operator like myself could.
This may not apply to you, but if there's any hint that it does, give some strong consideration to one of two things: either stop taking orders altogether, or put production times on these that are beyond the worst case scenario, explaining to each new or potential customer that the situation is what it is. In our case, our product was unique enough that our customers basically couldn't go anywhere else. What they did is adjust their re-sale lead times to match ours, and it basically worked out, though the boss was rather clueless why it did. And they were trusting enough with me and appreciative of my concern for them, that he never found out.
Satisfied customers are the goal. Make them happy, and they recommend your product to their friends. Make them angry with unkept promises or even the appearance of ineptitude, and they tell the world.
My future goal for the products I want to make is to tell my customers that they will get their orders when I am done making them. Period. End of discussion. However, my goal is to deliver a clearly superior product in a period of time that is acceptable to any reasonable person who is familiar with my industry (small run metal castings), and my customers will be my references to assure new customers that my production timetable - or lack thereof - is nothing to fear. For those insisting on delivery within the next two minutes, the alternative is simple. Find another mfg'er able to do that with the same quality. I'm not going to lose sleep over the loss of that sale, because it will probably come right back to me anyway, where the buyer sheepishly says, "well, ok, just let me know when it is finished."
This is the lesson lost on guys like my former boss, a truly unique and valuable product is something where demand outpaces supply, thus the mfg'er is the one driving the delivery timetable, not the customer. If I demand hand-built jewel-like craftsmanship, I pay any price and get on the waiting list ahead of the next guy, patiently waiting for the word that my work of art is done. For anything less than than, I work backwards. A 99 cent hamburger better be ready for me in less than five minutes.