Thank you, FredyCharles Sir.
I have gone thruogh the FAQ's and understood that any point of time can file perjury with having proper information.
The process for matainence case is yet to go live and as husband provided IT (TDS as working proof of his wife) for the current year. So, if my understanding is right about the perjury, can husband go filing the perjury even though the trial has not yet started? Please let me know.