I GW detectors -- How much has their sensitivity improved since 2008?

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According to Schutz's second edition of "A First Course in GR" on page 318:
The simplicity of the black hole model has made it possible to identify systems containing black holes based only on indirect evidence, on their effects on nearby gas and stars. Until gravitational wave detectors become sufficiently sensitive to detect radiation from black holes, this will be the only way to find them.
So to my question.
The book was written in 2008, since then have the GW detectors become sufficiently sensitive to detect radiation from black holes?
What has changed since 2008?

Thanks!
 
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This Wikipedia page has a nice list of GW detection events:

https://en.wikipedia.org/wiki/List_of_gravitational_wave_observations

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