First, the SHUSH Act has more cosponsors in the House and Senate with H.R. 3179 coming in at 18 cosponsors and S. 1505 at 8. The Senate version appears stuck in the Finance Committee while the House version has been in the Subcommittee on Crime, Terrorism, Homeland Security, and Investigations since July 24th.
Although the SHUSH Act is thought by many to have supplanted the 2017 HPA, the Hearing Protection Act has gained a few new supporters expanding from 158 cosponsors in July to 165 today. As mentioned before, the 2017 HPA is languishing in the Subcommittee on Crime, Terrorism, Homeland Security, and Investigations where it has been since February.