receiving Botox before or after an endoscopic brow lift?

I've come across information suggesting that some doctors administer Botox prior to an endoscopic brow lift. Is the advantage of using Botox beforehand primarily to promote better healing and allow the brows to settle higher? Could Botox be administered 2-3 weeks post-brow lift to achieve a similar outcome, and is this a recommended approach? Thank you for your insight!