We developed a preprint-publication linker that is available on github. Details here:

Cabanac, G., Oikonomidi, T., Boutron, I. (2021). Day-to-day discovery of preprint–publication links. Scientometrics. https://doi.org/10.1007/s11192-021-03900-7

We daily track 572 preprints of COVID19 randomized controlled trials for the COVID-NMA project. The results of the linking and validation of preprint-publication pairs by epidemiologists are available here:

https://www.irit.fr/~Guillaume.Cabanac/covid19-preprint-tracker