Just a quick comment in addition to Gerta's post.
R package meta has some internal function to do (back)transformations. For correlations, meta:::cor2z transforms correlations to Fisher's z and meta:::z2cor back-transforms Fisher's z transformed correlations.
For example, meta:::z2cor(m1$TE.random) would provide the random effects estimate of the correlation.
Best,
Guido
P.S. I will think about making the functions for (back)transformations accessible in R package meta.