In Safari Preferences/Extensions 1Password is there and checked on. I tried toggle it off and on but it still doesn't appear next to the address box. I noticed this because when I went to a login page 1P didn't show up as an option to in the username box and I couldn't get the unlock 1Password to appear.
1Password Version: 1Password 7 Version 7.7 (70700015) 1Password Store
Extension Version: Not Provided
OS Version: 11.0.1
Sync Type: Not Provided