Yield depends on many factors, mainly the bark quality (assuming you are using Mimosa or Acacia...whoops reread your original post...you are going with ACRB) and the skill of the extractor. If your starting materials are good then your end result is usually good too. A 1% yield is a fair average, I'd estimate. I am pulling this number from my own experience and from researching and communicating with many others on this site. You could get more. You could get less.
Others have seen up to 2% but that is considered rare.
Keep in mind that acacia has a lot of other alkaloids present such as NMT. It is psychoactive but is believed to be weaker than DMT. With a limonene tek you will be pulling DMT, NMT, β-Carbolines etc. so your end product will not be pure DMT. Do not be disheartened though. I really enjoy the synergy between NMT and DMT. If you want pure DMT from acacia, I would look into Cyb's tek or Earthwalkers tek. However those are not foodsafe.
In order to get all the goodies out, be sure to do a few extra "pulls" on your bark, especially if it is your first time. Anyway, I'm starting to ramble a bit...:d