The ships that will be build in the next ten years, will serve into the 2060s. Then China is the world power number one.
China is, and will at that time still be a great world power.
But number one?
I do not believe they will have surpassed the US Navy in numbers or technology in that time frame.
In fact, I do not believe China has plans to build 11 carriers and 11 large flat deck LHA/Ds that can act as carriers too.
Or, that they plan to build upwards of 100 Type 052Ds and Type 055s combined, or a force of 55 nuclear attack submarines.
So, it is arguable that they will, with their current plans, not surpass the US Navy at all.
Time will tell.