@vixmemon payouts begin around the 7th of each month. The payout that’s ongoing now is what pays for the ads seen in February. You can track the status at Ads Payout Status Update. It can take days or even weeks for payouts to complete.
If you are saying you have had your Rewards connected to Uphold for longer than just February and have not received payments, then you would need to complete a Rewards Support Ticket at https://support.brave.com/hc/en-us/requests/new?ticket_form_id=360001302431 so someone from Brave can see if they can help. Often lack of payments means your profile is flagged (suspended) or you just weren’t connected/verified.