H1B Amendment done after joining at workplace

I used to work for Client A at location A. Now I got a job at location A with Client B. My employer filed an lca for my job change since my new job is under the same MSA. However I was forcing him to file an amendment. But now I have joined at the new job location. Usually I join at the new work location once I have the receipt for my amendments.

Is it okay to file amendment little late.

My employer took the decision of lca change because I am going to file my extension in 2-3 months.

Thanks!

Did you get any RFE ? after how many days you filed ?