It wouldn't be the first time that an RC2 was released and there was an official release the next day. In iOS 16 or 17, I don't remember which intermediate version, they released an RC2 on a Monday and there was an official release on Tuesday.
As per ChatGPT:
“Yes, there have been instances where the Release Candidate (RC) or Golden Master (GM) version of iOS software was followed by the public release just one day later. Apple sometimes does this for specific updates, especially minor ones or those tied to hardware releases. Here are some examples:
Examples of iOS RC → Public Release in One Day:
1. iOS 14.2
• RC Release Date: November 4, 2020
• Public Release Date: November 5, 2020
2. iOS 16.0
• RC Release Date: September 7, 2022
• Public Release Date: September 8, 2022
• Reason: Coincided with the announcement and imminent launch of the iPhone 14 lineup.
3. iOS 17.0.3
• RC Release Date: October 3, 2023
• Public Release Date: October 4, 2023
• Reason: Urgent update to address overheating issues on the iPhone 15 Pro models.
Typical Timing
However, the standard gap between RC and public release is 3–7 days. For major updates, Apple releases the RC shortly after its September event, and the public version follows the week after. For example:
• iOS 15.0 RC: September 14, 2021 → Public Release: September 20, 2021 (6 days).
• iOS 16.0 RC: September 7, 2022 → Public Release: September 12, 2022 (5 days).
“