Scrape it off and do it right. You'll thank yourself later.

Thanks so much! This will be my morning project.

How long do I have to wait until it’s truly water proof and safe to shower in?

Depending on temperature, ideal would be 68 degrees Fahrenheit, it should be about 24-36 hours. If it's cooler this time of year, give it a good two days. If you have a second shower give it a few days to be sure because why not.

Thank you!

Caulk is good for a year tops, toss it and redo.

Thank you, and will do

I learned my lesson with expired caulk several years ago

I feel your pain!