Osage is the earliest ripening cultivar of the three and the nut that has the greatest amount of kernel packed inside the shell. Note that the Osage kernel has expanded enough inside the shell to begin compressing the inner-wall partition that separates the two kernel halves.
The Faith pecan is slightly behind in terms of kernel filling. I can still see a obvious line between the kernel tissue deposited on the dorsal side of the kernel half and the tissue deposited on the ventral side. The inner-wall partition inside this nut is still fairly wide; the kernel has not yet grown thick enough to apply compression pressure.
The kernel tissues of Yates 68 contain both white solid kernel and a layer of jelly-like kernel between upper and lower portions of solid kernel. Air spaces between kernel and the shell can also be seen. Yates 68 is at least 10-14 days behind Osage in terms of kernel filling.