Horford and Crowder did not make the trip to DC, so they're both for sure out for tomorrow's game against Washington. Crowder was expected, but it wasn't clear whether or not Horford would play.
KO did make the trip, though it's still a gametime decision on whether he plays or not.
I'm starting to get concerned about Al. This is seemingly taking a much longer time than normal with concussions. Tomorrow will be 9 days since it originally happened.
9 days is a while, but it's not crazy. Baseball, for example, has a minimum of 7 days you have to sit out. Most NFL concussions result in at least missing a game. Considering that teams don't practice until Wednesday, that would mean 10 days from concussion to practice for most of them.
Concussions are rarer in the NBA, but I personally wouldn't be worried until it's 2 weeks that he hasn't been cleared for anything. (Aside from the general worry of a concussion.)
That said, as I'll be at the game tomorrow, I'm personally disappointed in the injuries. There's nothing I like more than beating down the Wizards fans, many of whom still think they have a better team. And I love watching Crowder play in person.