This app was mentioned in 2 comments, with an average of 4.00 upvotes
https://play.google.com/store/apps/details?id=net.yancyparedes.davaojeepney
For future reference you can download this app my IT professor made back in the day to know where the jeepney routes traverses. Where it starts and ends and v.v
https://play.google.com/store/apps/details?id=net.yancyparedes.davaojeepney&hl=en
This one for android. I don't think Sakay.ph includes Davao yet.