The initial number of 8K heads, total affected divisions, was almost doubled to 15K. Divisional leadership is scrambling for the next few days to enlarge the layoff pool. I think the layoff would happen in one round per group, not a few released and then 3weeks latter a few more from the same group. Layoffs will happen corporate announce it to the business world at large, maybe not to its' divisional executives until after the fact.
It's a done deal, if you (fill in the name) are on the list it's gonna happen. On a Friday or the following Monday it doesn't matter. I'd hold off on vacation day(s) if you get laid off you have plenty of vacation and the $ in lieu of time off is a more beneficial condition.
I personally think the larger number was brewing, but not flowed down. The need to show strong direction / leadership / cost control cause the latest layoff number to be released into the world, without acknowledgement by divisional presidents. It's the number RTX must show to the markets in order to maintain its' valuation.