According to FAS and multiple open sources, China has about 300 nukes...total.
About 100 SLBM warheads and about 100 ICBM warheads...and another approx 100 tactical/bombs.
The US has 1,500 strategic warheads ready to launch on a moments notice and all delivery systems are proven. And we have a total of about 7,500 nukes in inventory.
Of one thing you can be CERTAIN, China will not shoot first and will so whatever is necessary to ensure we don’t either.
Their “deterrent” is barely credible and their counterforce laughable.
If the US put IRBMs in Japan and S Korea, China would take no effective action against them.
Keep in mind that 100 warheads in no laughing matter, particularly since we have no effective weapon against them. Assuming the SM-3 works, the total supply of 35 or so would take out only 8-9 or so given 4 per incoming. That leaves 90 smoking holes ...
As Mao once famously said to Nixon on their meeting (paraphrased): You kill half of us, and we still have twice your current population ...