Those are the standings as of now. By the time the group stage comes to an end, I expect Portugal to top the Group A (right now both Serbia and Portugal have 10 points from 4 matches, but Serbia is ahead as a result of better goal difference). If Portugal somehow misses the boat to Doha in 2022, then a lot of people will be disappointed. As you have correctly pointed out, it may be the last world cup appearance for Cristiano Ronaldo. He's already 36 years old and I don't think that he will continue playing until 2026.