You will receive the funds in your primary bank account that is registered with Upstox.
When placing a withdrawal request, you will be able to view the name of your primary bank account along with the last four digits of your bank account number where the funds will be credited.
Related Article:
How can I withdraw funds from my Upstox account?
Why has my withdrawal request been rejected?
How can I add funds to my Upstox account?
Why is my instant payout not credited to my bank account? (Deemed Success)?