Hello, @antoniskoutsaftis,
I am sorry but I do not have the exact time frame for the upcoming theme update, but I can assure you that our dev team is working hard on the new theme update and I am sure soon the new version will be available, maybe in a week, so we kindly request your patience.
And you can read more and all about the FSE mode in our theme documentation here: https://www.portotheme.com/wordpress/porto/documentation/?s=Full+Site+Editing
Best Regards,
PThemes Team.
