ODFW doesn't guarantee any specific dates. They merely specify the "week of", then deliver on any date that works best the hatcheries involved. Sometimes--depending on weather, employee illness, etc.--they don't get delivered at all. But, thankfully, they usually DO deliver sometime during the week that is scheduled.
Maybe others can chime in here. But, the only definite way I know to "confirm" a stocking; is to call the ODFW confirmation line--or, to call the hatchery (if you know which one is actually doing the stocking, for the water you want to fish).