You can get it before that as well but it shouldn't be very far in the future.
I heard somewhere within 2 or 3 months you need to start getting 3L+ salary.
I opened premier on the basis of existing salary slip which was less than 3L net salary and then I gave increment letter as well which was showing net salary more than 3L starting from 1 month later.
So first salary credit was less than 3L and later on it was more than 3L.
I hope that will help you.
If you want I can connect with you account sourcing person who can help you.