People who like to keep their passwords to themselves use Pass. However, a decent MacOS integration seemed to be wanting. Mac-Pass is a simple menu dropdown that copies the selected password to the clipboard for some time (45 seconds by default).
It also supports OTP tokens if the appropriate pass extension (pass-otp in Homebrew) is present.
To use it, simply place an OTP URL (otpauth://totp/...) in the first line of a password file.
The app was made with Platypus, a great way to turn some measly lines of shell code into a Mac app.
The shell script borrows heavily from passmenu.