Delayed OTA flashing after deep sleep

Mmm… that plea for help didn’t go so well… Let me try and explain it a bit better.
I’m a noob and I’m trying hard. Probably missing much too. As part of my reading on delayed OTA flashing I came acrossthis 2016 thread which clearly hinted at something in the works at Particle to allow this to happen easily. In the interim, work-arounds were presented. Apologies if I assumed incorrectly that there was a development since.
Let me be clear, OTA flashing is not the problem, it works fine. It’s just that I don’t know how to do it when my device is asleep and I need to catch it while awake. If there is a tutorial on this I would be grateful for a link. If not, some instructions would be highly appreciated.