"tell on" is correct and usable in written English. It is usually used to mean to inform someone in authority about misbehavior of another person. For example: My friend tried to cheat on the test, but I told on him and he got in trouble.
Only time will tell on that one.
Time will tell on that one.
Time will have to tell on this one.
So time will tell on that one.
Time will tell on them.
I could tell on him.
Time may tell on that.
"You shouldn't tell on people.
Did you tell on him?
Time will tell on what remains.
Tires, too, can tell on drivers.
Awesome tool! I started using it one year ago and I never had to look for another app
Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia