on the front burner
US /ɑn ðə frʌnt ˈbɜrnər/
UK /ɑn ðə frʌnt ˈbɜrnər/

1.
being dealt with or considered as a matter of high priority
:
•
The new project is on the front burner, so we need to focus all our efforts on it.
•
We have several issues on the front burner that need immediate attention.