http://superman-universes.blogspot.com/p/wellingverse.html

Wellingverse Dual-Identity Development:

Clark's iconic Superman years, that destination era we know does in fact begin with Smallville's final hour, can be glimpsed at a few rare points through out the series ("Finale" obviously included). This isn't even taking in account how we did get the Man of Steel's early years, a point still before fully mastering flight for keeps and first donning a certain full-fledged suit. This final era of Smallville that does get into the pre-named Kal-El's dual-identity begins half a dozen eps into Season 8, spanning from the unofficial "Prey"/"Identity" two-parter all the way until the series finale. You'll see how Kent goes from a cooler post-Crisis-esque cub reporter in the background to a somewhat nerdier pre-Crisis-esque reporter working his way up, the entire Clark/Lois/Kal-El dynamic, how Kent first encounters several more mythos foes as his alias, etc.

'Year One' ("Prey"/"Identity"-"Doomsday")
'Year Two' ("Savior"-"Salvation"/"Lazarus")
'Final Transition' ("Ambush"-"Prophecy")
'Phantom Zone Combat' ("Dominion")
'Iconic Era' ("Finale")