It helps. Common behavior in Japan, Taiwan, So. Korea, Singapore, HK, China.
Political systems are different. They cracked down differently. They have in common two things, 1) they routinely wear face masks and 2) and they have had effective results to coronavirus.
I think mask wearing will become routine in the USA before April ends. Yes the supply of masks will be there.
Debra Brix and Anthony Fauci have been lying to us about masks. from the start, they should have said: "masks do help but health care workers come first and we don't have enough of them yet for the public."
The government has been ill prepared for this obvious pandemic event, as Bill Gates warned in his 2015 TED talk. We should have been stocked to the hilt, run drills and war games, and spent 100 billion on preparation.
No one knew this virus was going to get us at this time. But we knew 100% that such a virus was bound to attack. The timing was the only question.
Next time we will be ready for those who are left.