ResearchGate indicates your h-index as 96 (incl. self-citations) and 92 (excl. self-citations) - see https://www.researchgate.net/profile/Mervyn-Maze-2/stats. However, other platforms may have another number of citations and thus another h-index. See https://www.researchgate.net/post/Why_citation_score_for_author_publications_looks_different_on_Scopus_research_gate_google_scholar for explanations.
If your university has access to Clarivate you might check https://clarivate.com/highly-cited-researchers/ (with undoubtedly info about the h-index, number of citations etc. based on the Web of Science data).
You might look at the publicly available “Stanford/Elsevier's Top 2% Scientist Rankings” which can be found here https://elsevier.digitalcommonsdata.com/datasets/btchxktzyw/7 and is described in the following paper: