Two words explain almost every question.
Posted
Yield has already been calculated and recorded in your IDDO, but it is still waiting for the release date.
Released
Yield has reached your USD balance. From here you can withdraw, convert or contribute again.
Schedule
Releases happen at 8 AM (UTC−3), Monday through Friday. If the date falls on a weekend, the release goes out on Monday.
Summary
- Posted means recorded; released means available in USD balance.
- Releases go out at 8 AM (UTC−3), Monday through Friday.