I wouldn't wait for it. There are basically two reasons why people get their Apple products engraved. The first reason is they think it looks great and the second one is that they want to be able to tell it's their product. If you think it looks great, you can wait for it. However, for the second reason you could also just decorate your case with a small sticker or something. For me, I just bought these for the sound quality and features. I'm also not someone that'll mix up my AirPods with someone else's.