After starting "state=Needs building" for long time

I want to build a snap on an arm64 architecture. Now I started with with "$ snapcraft remote-build$.
snapcraft remote-build --recover
All data sent to remote builders will be publicly available. Are you sure you want to continue? [y/N]: y
snapcraft remote-build is experimental and is subject to change - use with caution.
Found previously started build.
Build status for arch arm64: Needs building
Building snap package for arm64. This may take some time to finish.
Build status as of 2020-11-04 10:04:49.658623:
 arch=arm64 state=Needs building

Now the state did not change for the last half an hour. Is it working or waiting for some input of mine?