This is from last year. Iran, Egypt, Ethiopia, and the UAE have already joined. Argentina is definitely not going to join as long as that clown Milei is president, and frankly that's a good thing for BRICS.
The rest may well come sometime down the line, and in fact i was a bit surprised that Algeria wasn't among the new 2024 members. I am a bit skeptical about Thailand since it is getting pulled more and more into the US's orbit. Morocco also i have serious doubts about. And Nigeria could go either way... up until now they have been closely aligned with the West, but the trend in West Africa at the moment is toward countries reasserting their independence from colonial powers and Nigeria may eventually start hedging their bets just like the Saudis.