Hi Sara, I agree that your tour company should provide you with guidelines. We went on safari in Tanzania in February 2018. Our trip was arranged through the Africa Adventure Company and they provided tipping guidelines for every portion of the trip. Camps were basically $10 per night, per person, shared amongst all staff (put in tip box). Hotels were usually slightly less per night, per person. Porterage guidelines were $1 per bag. We had 12 nights on mainland Tanzania, 10 nights on actual safari. We ended up with a private guide for the entire trip but paid for a group tour which was a great bonus for us but probably a loss for our guide. The suggested tipping range was $200-$400 for two people. We tipped a bit higher due to the circumstances and the fact that he was an excellent guide. We were told that tipping is mostly appreciated in U.S. Dollars so it may be that the monetary preference varies depending upon the country in which you are traveling. We found that U.S. $1 bills were very handy to have. We brought $50 in $1 bills and wished we had brought more.
Hope you have a wonderful safari! It was the trip of a lifetime for us.