Luffy, as of this moment, needs to show his utilization of his Advanced CoA and CoO first before another Haki boost...
Zoro, I think he will have the most CoA boost for this arc as Enma seems to center with this but I guess the more apparent boost for him would involve more in his swordplay...
Nami, she needs to awaken her CoO, she needs it the most before moving on to the next Yonko face-off...
Usopp, I strongly believe that he'll be the 1st SH outside ZSJ (and maybe the mid tiers) to be able to use both CoA and CoO so I expect him to awaken CoA in this arc, he seems to be using his CoO well so far (he improved with his timing as seen when he gives away flyers, and when he was able to sense the BP who detected them from the shadows)...
Sanji, he needs to master the use of his Raid Suit 1st and utilize more with his current CoA since we rarely see him use it, before we get to see another Haki boost...
Chopper, I'm certain he'll awaken CoA in this arc, too early for him to awaken his DF since his captain is yet to awaken it, so in order to match the Zoan Army, he has to use CoA...
Robin, I'm pretty sure she has both already, Oda just doesn't want to show it, since 3D2Y (nah, even since LRLL/Foxy arc), she's yet to be involved in a real fight (most of the time, her opponents are fodders or she's being robbed of an opponent by another people), this is her chance...
Franky, I'm actually 50/50 about him since he still seems to be considered as one of the mid tiers of the crew (as seen when they annihilated the entrance guards while Nami, Usopp and Chopper hid), I expect him to awaken CoA but I won't be surprised if he awakens both...
Brook, just like Franky's case (I won't be surprised if he'll awaken both), but expecting more on CoO since I believe he'll boost more on swordplay (obviously not as apparent as Zoro's)...
Jinbe, we have yet to see him utilize his CoO, actually we have yet to see him use his full potential in battles (he's mostly fighting fodders and protecting Luffy during the MF War; and only used a few during the WCI Escape), so I'm 100% sure that he won't get any boost...
My reason behind that thinking: They're now fighting 1 Yonko after another, and oh, they'll face off against 2 this time... Without Haki from the non-Haki users, they'll always get disadvantage from the Haki users (even fodders can use them)... They can't depend on ZSJ all the time against Logia or any other tough abilities... Besides, Wano arc is set to make them Yonko-tier crew...