Its been 2 hours and im using brave, none Ads have showed up

Hey guys i have been using brave browser for 2 hours, untill now no ad has appeared. Im using a mobile version and i have enabled my brave rewards.
Im from Algeria by the way, is my country supported?

Yes, it’s supported. From FAQ: Why am I not seeing Brave Ads?

"When I opt in to Brave Ads, my browser will try to show me ads which are relevant to me."

The difference in wording may seem small, but there is a substantial difference conceptually. The goal is to show you privacy respecting ads that are relevant to the user in the right context (a “match” is found) – not to make sure that all users “see some ads” . Enabling Ads does not guarantee that you’re going to see ads – if the system does not find a match for you in the ads catalog, then you will not see any (more information on this below).

It’s also depends on the availability of ads campaign in your country.