Emmm for VI it should be sending our batch-by-batch, so it can be within 2 weeks, or longer say 1-2 week(s) after the application deadline, if you passed the screening.

If you talk about how should be let them know about your plan on persuing a Master degree, I guess there are 2 ways, either:

1. You mention your master degree as an item on your CV, given you got the offer already, or
2. You wait until having an interview chance and share it directly to HR.

Guess these are the only ways to go. All the best!!