China reportedly considers lowering 2020 growth expectations due to coronavirus hit
Bloomberg reports, citing people familiar with the matter

Adding that officials are also considering more measures to bolster the economy, although final decisions on the above matters have not been made.
I reckon the date to watch for any official changes to China's economic target and plans will come via the National People's Congress, which is to begin on 5 March.
But given the situation surround the coronavirus outbreak, we'll have to see if the session will progress according to schedule or not - should things not calm down by then.