This meta-analysis is a systematic review and synthesis of the Arabic Natural Language Processing (NLP) dataset landscape, in accordance with PRISMA guidelines. The review locates and categorizes publicly accessible datasets in NLP tasks that span a spectrum of sentiment analysis, text classification, question answering, summarization, dialect detection, and paraphrasing. Key datasets catalogues like Masader and Masader Plus are underscored as driven by enhancing discoverability and metadata standardisation, whereas task and domain-specific creation of resources are represented by ArabSis, SNAD, A-MASA, AGS and WiHArD. As can be seen, although the amount and variety of the datasets have grown in recent years, there is still a considerable number of gaps in the coverage of dialects, domain specificity and quality of annotations. The review ends with suggestions on how to extend underexploited areas, annotation behavior, and open-access to accelerate the Arabic NLP research and application.