TROS is only barely going to pass Rogue One, both domestically and worldwide, and end up with almost $100m less than TLJ domestically and around $200m less worldwide.
The totals for the ST will likely be:
TFA - $248m opening/$936m domestic/$2B worldwide,
TLJ - $220m opening/$620m domestic/$1.3B worldwide,
TROS - $177m opening/$530m domestic/$1.1B worldwide
(Incredibly, TROS is only just barely going to pass Joker's worldwide total - which no one would have believed six months ago)
TROS is basically going to be slightly above RO across the board:
RO - $155m opening/$523m domestic/$1.05B worldwide
As many had paralleled TLJ's performance to ESB (as a normal "middle trilogy film drop"), here is a domestic comparison of the OT initial releases, even if yeah, a VERY different BO era to today:
ANH: $307m
ESB: $209m
ROTJ: $253m
But if that OT/ST parallel were to be correct, and the TFA/TLJ drop was a normal phenomenon, then TROS should have grossed $1.65B worldwide as the "end of the trilogy" climax (though TROS was sold, and to some degree written, as both end of trilogy AND end of the 9 film saga, which should have in theory increased its appeal.)
My feeling all along was that SW always relies heavily on what came before: TFA was huge because it was a return to heavy OT-esque story/visuals after the trauma of the PT, and after a SW 10 year hiatus, and the film delivered big on nostalgia (copying ANH and mining OT warm-fuzzies) TLJ did pretty well because its predecessor TFA was popular. And TROS hasn't lived up to that OT parallel (where the third film lands halfway between the first and second films' BO) because TLJ was so incredibly divisive.
So that ESB/TLJ BO parallel (and some even tried to argue there was a "backlash" against ESB also) was garbage all along.