12.6-12.8 is 100% charge at rest assuming FLA rather than AGM. The first 30 minutes after charging, a battery may retain a surface charge over 13.0v but that always dissipates and should not be considered state of charge.
https://duckduckgo.com/?q=AGM+battery+SOC+chart&t=osx&ia=images&iax=images&iai=http%3A%2F%2Fwww.lanchbury.id.au%2Fwp-content%2Fuploads%2F2018%2F09%2FBattery-State-Of-Charge.png
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2021 Cayman GTS 4.0L
2020 Macan (dog hauler)
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