How many years ago was the carbonized wheat unearthed from the Neolithic site in Peacock River Valley, Xinjiang?

According to archaeological excavations, carbonized wheat unearthed from Neolithic sites in Peacock River Valley, Xinjiang, has been more than 4,000 years ago. Haimenkou, Jianchuan, Yunnan and Boxian, Anhui also developed carbonized wheat more than 3,000 years ago. It shows that during the Yin and Zhou Dynasties, wheat planting had spread to Yunnan and Huaibei Plain. There are two words "Lai" and "Mai" in Oracle Bone Inscriptions, which is the first word of Mai. In The Book of Songs, "Lai" and "Mai" are used together, and "Lai" and "A" are different. It is generally believed that "Lai" refers to wheat and "Mou" refers to barley. Later, the word "mai" was often used in ancient books. In the future, with the popularization of wheat crops such as barley and oats, it is called "wheat" for the sake of easy distinction.