In the head-to-head records of the two matches that have been played, Poland was able to beat Wales overall and in the Euro Qualification match which will take place in the next few days, Poland is indeed the favorite.
Poland on paper is far superior and of course many people will think that Poland can definitely beat Wales again easily.
And in the three remaining matches, I also agree with the prediction you made about the 3 teams that are guaranteed to qualify, namely Poland, Ukraine and Greece because they look more stable than the other 3 team.
Georgia, Iceland and Wales are the teams that are likely to be eliminated, if there is chance or surprise, maybe Iceland can qualify by beating Ukraine, but this will only happen if Iceland has luck or surprises.