Basically Capone's situation could be (at least) two ways.
1. Capone is allied with Big Mom, and they're getting ready to attack Sunny and take Cesar
2. Capone is allied with Law, and Sanji & co have been captured. Capone is about to attack Big Mom's ship to retake Cesar.
Capone's speech talks about Law and Luffy's ordeal as an achievement by friends. He could be sarcastic, or addressing Sanji callilng them "his" friends. It's equally possible.
I do have to mention though, the Sunny and BM ship encounter happened hours ago, and now news of Luffy's victory reached Capone's ears.
It's quite likely that Sanji's fight is long over with, which would lend credence to option 2.
But we'll have to wait and see the next few chapters.
It will be option 2 of course… You will see