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It been 8 months completed.

So no issue immigration wise if you lived together in Canada for 8 months before separating. As long as you and your spouse meet the requirements to file for divorce in Ontario/Canada there is no reason why you shouldn’t file for divorce in Ontario/Canada especially if you are both residents of Ontario. As you are already aware you will have to wait to file until you have been separated for 1 year.
 
Since Aug 22 in India he left me . After that I came by taking travel documents to Canada on Sept 20, 2024

So you are only visiting Canada. Upon entry you are normally only granted a 6 month visit so you apply to extend your visit? Why are you in Canada if you have been separated for almost 2 years and you separated in India.
 
i did not seperate on my own just waiting for him only till now. landed in 2020.

This is very confusing what do you mean by you didn’t separate on your own. Either you are separated or not. You and your future ex should have the same date of separation.