We used our tele zooms more than regular lenses on safari in Africa. That's a 150-500mm sigma FF for my mate and 70-300mm crop for me.
Now that's not Mozambique, but Kenya we got mega close to the animals, Tanzania we were struggling at the tele end to get close enough.
I don't know Nikons but it looks like that's a crop. Sticking a 150-500 on a crop is going to be great for that leopard 200m away but rubbish when a lion is trying to crawl under the bus (these things were 30 minutes apart).
Personally I'd get something like a 70-300 and hope you get close, and put the extra towards a second body (or rent one). And stick one of your primes on it, probably the 50mm but anything wider would be a bonus (18-55 kit?)
I can't stress enough how dusty we found it, my mates camera was more brown than black with dust after the mara to nairobi 6 hour drive. My mirror was not in a good state (one of the items was a hair) despite the lens and body being attached and immaculate from the UK. The lens only came off after the fact to remove said hair - and body and lens were apparently weather sealed.
Again not the same area but for us weight wasn't an issue, we only did a couple of walks most of it was game drives. On which basis - take something to sit the camera(s) on / wrap around it to prevent dust while not using it. The vehicles we were in weren't exactly clean or with nice cushioned surfaces.
Take every piece of camera cleaning equipment you own that'll fit. Including sensor stuff if you have it and know how to do it. Don't start experimenting there.
And non-camera related but take some hand gel!
Enjoy

Remember to put the camera down and soak it up a few times, I didn't do this enough.