It must have just been unified. From the beginning, we saw a scene of destroying weapons and making gold figures (that is, bronze statues)

According to the Historical Records of Qin Shihuang Zai, in the year when he completed the unification of the six kingdoms, Qin Shihuang issued an order to destroy weapons, "Collect all the soldiers from the world, gather them in Xianyang, and sell them as Zhongqi and Twelve Jinren, each weighing a thousand stones."

It should be the year after unification.