Don't count your chickens before they hatch
In Yoruba Má ka ẹyẹ́ kọ́kọ́ kà kí ó tó yọ́
This idiom is a Yoruba proverb that warns against celebrating before the task is completed.
Example
"Má ka ẹyẹ́ kọ́kọ́ kà kí ó tó yọ́, ẹ jẹ́ kí a dúró de àbájáde."