On the front burner
Definition 1 of 1
Pro Tip 1/3Urgency Signifier
Describes something that requires immediate action or attention. 
Discussing climate change is on the front burner during the summit.
Pro Tip 2/3Shift in Focus
Used to indicate that something has become a current priority over other matters. 
With the deadline approaching, report completion is on the front burner.
Pro Tip 3/3Temporary Status
Suggests that priorities can change, and what is important now may not be later. 
Right now, our customer service improvement is on the front burner.