I would guess spring 24 at the earliest if filming starts this fall they'll be shooting for maybe 9-10 months at a guess then 8 months in post production/CGI it rounds out about a spring/early summer 24 release
The COVID delays withstanding, has filming really taking that long for seasons? 9-10 months? I had figured that was something more along the lines of 4-5 months.
It is not completely done, but they do have the outline for the season done. I am betting that filming won't be as widespread next season, so that would decrease time as well.
Also, I believe season 4 was the first time they released a season where it didn't happen around the same time of the year. Like season 3 released in July and the battle at the mall happened on the 4th of July. Similar to season 2 when it released right before Halloween and it took right around the same time on the show.
Season 4 (at least volume 1) is 6 months after the battle of Starcourt Mall, which would place it sometime in January. So it will be interesting what they will do with Season 5. Will they try to line it up with the current time of the year like they have in prior seasons or just abandon that. If they want to line up the time of the year in season 5 to our real time of the year, that could some delay.