"stage of maturity" is correct and usable in written English.
You can use it to refer to the stage of physical or mental development that someone or something has arrived at. For example, "He has reached an advanced stage of maturity in his career."
The company believes that in both the markets, the industry is in a stage of maturity such that each supplier has sufficient scale to compete.
The essential oil obtained from mature fruits, at the final stage of maturity consists mainly in linalool (69.8-87.54%) which can be developed as a potential fumigant for stored-products protection [35, 36].
We then scored the stage of maturity (immature, i.e., that had never flowered yet, or mature, i.e., that had already flowered) of each individual.
"I'm not a young man any more, or a 30-year-old, so I've reached a stage of maturity.
After cell expansion has slowed and become nominal, fruits enter the stage of maturity and undergo preparation for ripening.
Fiber optic sensors (FOSs) are progressively reaching a stage of maturity as a sensing technology in biomedical applications.
Corn was harvested at three-quarters milk line stage of maturity at TLC of 1.90 or 2.54 cm.
Stage of maturity (SM) and cutting time (CT) are important factors affecting the feeding value of alfalfa hay in ruminants.
The optimum stage of maturity to harvest maize silage for feeding to dairy cows is approximately 300 g/kg.
Whole plant corn was harvested at the medium dough stage of maturity (30% DM), chapped and ensiled in horizontal silos.
Vegetables for storage must be free from mechanical, insect, and disease injury and should be at the proper stage of maturity.
