There is a three day period following Official Release where Early Access users have time to find their official release Endwalker codes to put them into the mogstation.
Console users will be prompted to put said codes in as soon as they attempt to log in post Official Release, while PC/Mac users need to find the codes from their retailers. Steam users already have their codes in their cd-key list for the game, but can't put it in until Official Release.
As for the free 14 days, no that was a special bonus in ARR for eligible 1.0 players, and only at that time. PS3 is no longer supported by the game, and if you are a returner from the pre-Stormblood Era unfortunately you must buy a licence for either ps4/ps5/pc/mac/steam and then tie said licence to your existing service account, or start from scratch.
Here is a lodestone post that details it better and provides link to more resources:
Endwalker Early Access
Also, as an aside, this thread is 8 years old at this point, you would have been better off making a new one with a more focused topic/question.
