What is the grace period to file a case for labor rights after resignation?

Hi Sir/Madam,

I want to know what happens when I resign after I completed the probation period.

My company did not cancel my visa and did not pay me my gratuity and pending money.

It's almost 4 months and my visa is valid till December.

So how long do I need to wait? Or what is the maximum time to go to court for filing a case?

Is there any time period or I can go after 5 or 6 months?

Please guide me.