(only) time will tell

it is necessary to wait to find out something.

Farmers are experimenting with a new type of corn, and only time will tell whether it's better than the old one.

• do the honours
• do the job
• do the rounds
• do the running
• do the trick
• do the unthinkable
• do the world of good
• do things by halves
• do time
• dot i's and cross the t's
• dot i's and cross t's
• dot i's and cross your t's
• dot the i's and cross the t's
• dot the i's and cross t's
• dot the i's and cross your t's
• dot your i's and cross the t's
• dot your i's and cross t's
• dot your i's and cross your t's
• double bind
• double-dip
• double-dipping
• double Dutch
• double entendre
• double over
• double-talk