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If you want to vote by mail please do so as soon as you can and consider dropping it off at the counter where they will postmark it right away.
Also if you live in a state where you’re allowed to photograph your ballot consider doing so to have proof you voted a certain way.
Note that as a counterpoint the federal register website claims they are just clarifying language to improve public understanding: https://www.federalregister.gov/documents/2025/08/12/2025-15266/postmarks-and-postal-possession
I didn’t check that document very closely yet.
In Germany, you usually don’t hand in letters, nor does the postman collect letters at your home. You throw them into a post box on the main street, which is emptied once or twice a day. So by the time the postal worker collects the mail they don’t have any means to know who posted which letter.
For really important mail you also have the option to use “Einschreiben” (registered mail) where the recipient has to sign that they received the letter.