OPKs - first time

KS

This cycle is going to be our first one TTC. As I don't fully trust the app to predict my fertile window I'm going to bulk buy OPKs and test everyday, especially for the first few months to get a better idea of my ovulation. My period is normally about 5 days so would it be OK to start using OPKs around CD10? Also, what time of day is best? I leave for work at 7am and get back home around 5-6pm. Thank you 😊