When can I add my fish?

Hello! I’ve been cycling my tank since about December 14th, feeding it every week or so- I’ve watched the levels rise and drop at least twice is this good enough to add my fish? Should I cycle it longer? How high should the ammonia be when testing? I’ve never really caught up going very high so I’m not sure if it needs to be high before I can add a fish or not- also do I remove the mouldy food off of the bottom?