odbc is stable, though there are still corner cases where it could have issues with certain database backends. Mostly around text encodings, datetime and logical formats.
The "Developing odbc" vignette at vignette("develop") contains instructions on running the tests locally, which is important to make the feedback loop shorter.
The hardest part of maintaining odbc is often an issue only occurs with a specific database, and setting up the environment for that database usually takes a non-trivial amount of time.
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Convert from using Rcpp to using cpp11. This is not urgent, but basically all other r-lib/tidyverse packages have been converted.
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Look into updating the version of nanodbc to a newer version. This is complicated by the fact that nanodbc now requires C++14, so it can't really be a drop in unless we want to bump up odbc to require C++14. Alternatively look into the recent nanodbc comments and port them to the current version of odbc. We did this for other use cases.