Once approved (V3), we will begin the process.
Once you've confirmed that part (have done), we will begin the process.
Once it's approved (be done), we will begin the process.
We'd like to order the raw materials to support the production. Could you please give us green light on ordering the materials by email? Once we get your approval, we'll order the materials.
Once we found the good conditions, we will scale up the reaction and push the chemistry forward to get the final target.
Once we got the approval from our client for this expensive reagent, we will order it.