The part of a sentence "once we get the approval" is correct and usable in written English. You can use this phrase when you are referring to something that will happen in the future - once a certain condition or event has been satisfied. For example: Once we get the approval from the board, we can start work on the new project.
Even if once we get the approvals we have to crescendo up to the launch date, make sure everybody's connected.
Once we got the nod of approval from LA, we were able to go anywhere.
Once we got the first goal we looked very dangerous.
"Overall once we got the grip on the game, we showed the quality we've got.
Once we got the goal and the fans got behind us it was a different game.
Once we got the skin region, we can turn to construct the chromaticity bases and luminance distribution.
We've got 140 stocks up and running; once we get SEC approval this year, we'll put all of our stocks up.
I love the desktop app, it’s always running on my Mac. Ludwig is the best English buddy, it answers my 100 queries per day and stays cool.
Cristina Valenza
Retail Lead Linguist @ Apple Inc.