Right now:
Eureka Anemos - 355, 5 slots
Tome - 360
Tome+ - 370
Savage - 375
With patch content:
Eureka Anemos: 355, 5 slots
Tome: 360
Crafted+: 360
Tome+: 370
Savage: 375
Ultimate
That leaves the EX primal weapon, Heaven on high weapon and the relic. The EX weapon is probably 365 (available on patch), and maybe the heaven on high weapon (1 month delay), too. Relic is a toss up but since it has 5 slots I'm guessing it won't be higher than 370 at the high end for now.
If the apocalypse happens and the relic ends up at 380 with 5 slots the grind will be so bad most people probably won't finish it before the next patch comes out invalidating it anyways. The last time the relic hit raid weapon ilvl on a patch that wasn't end of expansion was the unidentified step (gordias) and we all know how that went.