All those Asian countries are in like Flynn, but China is notably not playing ball.
When everyone signs this agreement, and no tariffs apply, then Chinese goods will go from the cheapest to the most expensive. Their entire economy is based on exports. Their entire economy is at risk.
The provisions deliberately exclude China. For example, yarn for clothing must come from member countries, and not from China.
This could potentially invite retaliation from China, an economic superpower in their own right.