It turns out that I wasn’t the only one who created an Instagram account for pictures of COVID-19 related signs.
My account is @covid_19_signs_nyc.
Other people have made accounts such as @covid19signslimerick, @duetocovid19, @signs_of_covid, and @signs_ofcovid. There’s even a website aggregating signs from multiple sources at duetocovid19.com.