Ivermectin hasn't been proven to be effective.
At least two large double blind studies are ongoing. The TOGETHER trial has finished up. Preliminary data shows no help. Final report will be issuing the near future. The UK PRINCIPLE trial has not released results.
There are 6,640 studies that have been completed or are ongoing related to COVID-19. Many are on therapeutics.
https://clinicaltrials.gov/ct2/results?cond=COVID-19
Remdesivir has been proven to be effective and has full authorization.
Monoclonal antibody treatments have been proved effective and 2 have been issued an EUA. A third had it's EUA pulled because it was ineffective after more complete data was compiled.
Veklury (antiviral) has EUA.
https://www.fda.gov/drugs/emergency-preparedness-drugs/coronavirus-covid-19-drugs
Statin might be of promise. Each study I have read states that there were other influences that might be more of the cause of improvement than the Statin itself. More trials are in the works.
Actual effective treatments are hard to come by. Treatments tend to reduce symptoms more than actually treat the disease.
We don't have effective treatments for chicken pox or measles. For the most part we treat the symptoms. We have Tamiflu for the flu, though it's actual effectiveness is questionable.
Meta studies are only as good as the studies that are included. Many of the included studies (both pro and con) are small, not double blind, or flawed.