You’ll have a great time. I did Brad’s Khutzeymateen trip last year. It’s a beautiful place and Jen and Chris from Oceanlight do a nice job.I encourage you to review Brad Hill's review of lenses. He lives in British Columbia and near the Khutzeymateen. He is a wildlife photographer specializing in bears. He tests the lenses extensively in the field before publishing his findings. I am going with him to the Khutzeymateen this June. He strongly recommended I replace my 500 PF with the 400 f4.5 and bring my 100-400. I will be shooting a Z9 and Z8. I am leaving my 600mm TC at home.......since ALL our shooting will be hand held from a Zodiac.
I used the Z 100-400 mm on my Z9 for almost all of my shots. I had a Z7II along and used the Z 24-120 on it a few times. Also had a 500 mm PF plus 1.4x TCIII along that I put on the Z7II in case we saw distant wolves, but did not use it. I had the Z 1.4x TC along but did not put it on the Z 100-400, as I used 100 mm more than I had expected. There was only one time when I wished I had had more focal length on my camera — a pair of sparring young males that were further off. But even there, with the Z 100-400 at 400 mm and cropping, I got good shots.
Longer focal length might be nice at times. Michelle Valberg also does Khutzeymateen trips with Oceanlight. She posted some shots from a recent trip there on Instagram taken with her Z 800 mm PF.