Looks great Phil, I am going to mimic your trees!
There's a few variables on that last question of how long it takes apple trees to mature and bare fruit...
1) quality & size of trees you bought. If you are getting 6' trees that are 1" in diameter VS 2-3' trees that are 1/2" in diameter: maybe a 1-2 years difference in fruit bearing.
2)Rain, weed control, pest control, soil site, growth, etc, etc.
3)Type of apple trees you plant. (some trees require 2 trees to cross pollinate eachother- I always order 4-5 of any variety SO it's a non-issue anyways) (I also order something like an apple tree called WINTER BANANA or Muncharian Crab Apple that are great POLLINATORS and they obviously produce fruit)
4)Luck (ok, most of this is controlled & a lot is weather related- cold frosts, rain, etc BUT some is for sure luck!)
Ok, so I promise, I had good amount of fruit on several of my trees the 1st summer they were in my soil. I had other trees where the 4th year- NOTHING so far. I would say from MY EXPERIENCE it averages 3 growing seasons to get fruit. If you plant high quality trees, a variety of trees, keep weeds GONE, fertilize/lime 2nd year & going forward, prune, etc, etc - you should have SOME fruit in 2-3 years for sure.
Now, I'd say it's 5+ until you have LOTS of fruit. You're not going to take the fence down before then anyways for sure- likely 6-8 years. 6-8 years in tree terms is QUICK & in hunting seasons and LIFE- 6-8 years goes by FAST! Plant the trees, do the work, take care of them and they'll take care of you for years!!!!!!! Apple trees are great and I'm so thankful I planted them!!!