quick question about induction/c-section

Whitney • 25. Married to my best friend and enjoying my baby girl. 💜❤
I have an ultrasound On Thursday and I'll be almost 38 weeks. They're doing it to check her growth from the 31st, my last ultrasound, cause they think she's gonna be big. 
My question is if they say yes to an inducement or c section how quickly will I get the set date? Was your experience that they tell you at that app or call later??