Can I apply for immigration after working in Canada for 2 years with a labor visa guaranteed by a Canadian employer?

You can apply for immigration. The application time is definitely shorter than the waiting time in China. As far as I know, a person who works as a domestic worker through labor export has been in Canada for 4 years and applied for permanent residence after working for 2 years. She has been a permanent resident for more than 1 year. So I estimate that after two years, I can get permanent residents in less than one year. And part of your working time in Canada in the first two years can be counted as the time you need to apply for citizenship in the future.