Yes...tried this a year ago with no luck.
That's the key, they will take an extra year if they were not stratified (say, eaten by bird like above). So, in actuality, they should come up the year after you intended. If you're grabbing loads of free seed off trees, that's a no cost, easy way to do it but takes more time.
Your next step to progress faster would be doing the stratification process yourself OR buying stratified seed. I'd recommend the 2nd. I looked into purchasing the de-pulping machine for seeds and you're into the thousands. If you want a contact where you can purchase stratified cedar seed, let me know.
Your last very viable route is buying cedar trees from nursery or transplanting. Transplanting takes a lot of time to dig up, etc but of course your success will go up. If it's large scale, I wouldn't transplant, I'd buy bare roots. Small scale, dig em up and move em. I'm a lunatic and actually have a tree spade for the bobcat that can transplant 6' tall trees or WHATEVER but of course, that's kinda nutty and expensive, sure is handy though

Then, i have a tree planter that goes behind the tractor for little trees. Can do couple hundred an hour BUT the only thing I don't like about that is that the trees are in LINES. Sometimes that's ok (screens or it is still really good for cover too) but sometimes I want the natural disbursement of trees here and there like nature pops em up. Good luck!