To get details on the number of I-526 petitions received, approved, denied, pending etc.,
https://www.uscis.gov/tools/reports-studies/immigration-forms-data -> Filter by category = EB-5 -> Apply Filter
In the results, look for something like "Immigrant Petition by Alien Entrepreneur (Form I-526) Quarterly Report (Fiscal Year 2019, 2nd Quarter, Jan. 1-Mar. 31, 2019)" . Sample link https://www.uscis.gov/sites/default/files/USCIS/Resources/Reports%20and%20Studies/Immigration%20Forms%20Data/Employment-based/I526_performancedata_fy2019_qtr2.pdf
You can also go to https://www.uscis.gov/tools/reports-studies/immigration-forms-data via
https://www.uscis.gov/sitemap -> Search for "Studies" -> click on "Immigration and Citizenship Data" link.
- I-526 case status - https://egov.uscis.gov/casestatus/landing.do
- https://www.uscis.gov/news/news-releases/uscis-adjusts-process-managing-eb-5-visa-petition-inventory - Starting from 2020-03-31, I-526 applications will be processed based on visa availability. Previously, they used to process it on a first in first out basis.