I have 2 USB150 that I have been waiting on fixes and features promised in 4.x for more than two years. See this post from early 2021:
Since these routers are not on the list you posted and they go EOL this year, I have doubts I will ever see this promised update.
After seeing multiple time frames given for 4.x on older products, l am the point that I will believe my routers will get 4.x fully released firmware when and if I ever see it.