Almost all of the deaths, if not all came from Hondas, specifically the Accord and Civic. I highly doubt that GM used the same exact inflator as Honda did. Maybe the same technology and design, but based on the larger airbag it was definitely a different inflator.
I have heard that GM has data for over 60,000 deployments without a single issue. I would assume you are safe to drive your truck until replacement are available.
And why only the right hand side? Due to volume GM may have actually sourced more than one supplier. Due to part traceability of safety critical items like this, they know what your truck has in it and if anyone sneezed on it prior to installation.