I had a big update not long ago and thought it was on automatic updates but it skipped this one. thanks so much for the heads up!!!!
The following is being posted as general information. The last major update was the Anniversary Update (Version 1607) which began rolling out in July 2016 and took months to complete rolling out. The current major update is Creators Update (Version 1703) which started rolling out in April 2014 [but was intended for March] and will also take months to complete rolling out.
The major updates are not pushed out to all existing Windows 10 installations on a single day or even over a few days. The embedded base is divided (how, only Microsoft knows) into cohorts and the major updates are rolled out one cohort at a time. Generally the earliest cohorts have the longest lag time between each being rolled out, which makes sense because you're almost certain to have more issues with things you simply couldn't test for with any testbed since the amount and kinds of hardware on which Windows 10 is running can't be replicated no matter how one might try. As telemetry is collected and issues fixed each successive roll out is less subject to finding new bugs.
The long and the short of the above is major updates aren't "being missed" because any given machine doesn't have them the first week to several weeks after it begins rolling out. I forced the installation on the machine I'm writing from but the other two Windows 10 machines in my household, on Pro 32-bit and the other Home 64-bit, don't have it yet and may not have it for months depending on what's going on with the early cohorts and what needs to be tweaked.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
Memory is a crazy woman that hoards rags and throws away food.
~ Austin O'Malley