So, every team that made the Ro16 at the world cup is guaranteed a spot in one of the four final Olympic qualification tournament. In the end the top 23 or 24 teams (depending on where Japan finishes) will qualify.
However, based on FIBA ranking the following teams that aren’t currently guaranteed to qualify for the OQT based on their World Cup finish should qualify:
Africa:
1. Nigeria
2. Senegal
Angola and Tunisia should also be safe. Egypt, Cameroon and Morocco are on the bubble in that order.
Americas:
1. Mexico
2. Canada
Mexico cannot qualify through the World Cup. If Canada qualifies for the OQT through the World Cup their spot should go to Uruguay. Other than whether Canada qualifies through the World Cup or the world ranking there is no drama here.
Asia / Oceania:
1. Iran
2. China
The Philippines and South Korea should also be safe. New Zealand, Jordan, Lebanon and Taiwan are on the bubble, in that order.
Europe:
1. Slovenia
2. Croatia
This one is actually pretty secure since neither Slovenia nor Croatia can qualify for the OQT through the WC.
The above assumes no major shakeup in the relative world ranking of the teams that fail to make the top 16 at the World Cup.
Edit: this qualification system is terrible.