Currently it's 30-45Mb depending on the OS. We're working on providing a "lite" version of the runtime, that doesn't include tools like formatter or linter. Preliminary works show that we should be able to trim executables down to about 20Mb.
Currently binary size is a bit larger than the `deno` cli.
We are currently working on reducing size for these `deno compile` binaries though. From preliminary testing we think we can reduce size by around 60% - maybe even more.