There was 0 ammonia and 0 nitrite so that would indicate the filter has cycled, unless you did a huge water change before testing the water.
You try to keep nitrates below 20ppm at all times but it's hard to do so we suggest doing a big (75%) water change each week to try and keep them at or below 20ppm. If you add lots of food and have lots of fish in the tank, the nitrates can go up pretty quickly. If you only have a few fish or only feed a few times a week, the nitrates won't go up as fast or as high.
If you grow live aquatic plants in the tank, they use some of the ammonia and help reduce the nitrates. Most floating plants are fine in Rift Lake tanks and some fish will eat them as part of their natural diet, while other fish ignore the plants. But most cichlids will dig up plants and cause them to float. Water Sprite and Duckweed are 2 good floating plants to try.