If you want the latest ports.tgz, you obviously would need to check the dates.
Remember that there only is one ports tree, so it is OK to download the ports.tgz from the latest -current available, regardless of the OS version number. Or from a snapshot.
A ports.tgz from a -release is frozen for that release and will not change.
Also, you still will need an Internet connection, even for pkg_add'ing ports and the needed dependencies.
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