You may check here in order to track the development of your Zambia visa application. You need to acquire a Zambia visa to be able to travel there for tourism, company and official purposes. If this is the case, you will need to acquire a Zimbabwe visa to go to Zimbabwe for tourism and business purposes. Furthermore, it's one of the biggest game reserves in Zimbabwe. In terms of when is the ideal time to visit Zambia, there is absolutely no strict rule. There are lots of places in Africa that ought to be high up on your trip bucket list, and I think that Zambia should be one of them!