At this time, you can bring the new cat(s)

The more we have cats living in harmony, the easier it is to integrate new ones.
Free-ranging and feral cats lead complex and busy lives. They maintain far larger territories than most people realize, and these territories often contain a variety of environments, such as forests, farmlands, urban gardens and yards. Within these territories, cats explore, hunt and scavenge for food alone. They only occasionally interact with other cats. They don't live in groups or even pairs, and they don't seek out contact with other cats. In fact, they actively avoid it. Considering this natural behavior of cats, it isn't surprising that it can be very difficult to introduce a new cat into an established cat's territory, even when that territory is your home.
of How to Introduce a New Cat to Other Cats was reviewed by  on October 21, 2016.
Place a cleanon your hand and gently rub the newcomer along the face to collect some facial pheromones. Pheromones are scent chemicals that are released from a cat’s scent glands. The pheromones around the cat’s face (along the sides of the mouth, on the chin, cheeks and on forehead) are basically “friendly” pheromones. Cats facially rub on objects in locations where they feel comfortable. So by using the sock, we’re going to create a simulated cat that contains lots of friendly pheromones. New to Cats    Shopping List for Your New CatNew to Cats    Shopping List for Your New CatCats may take six months to two years to adjust to a new kitty friend.
How do you successfully introduce a new cat into your household if you already have other pets? As cats can be territorial creatures, bringing a new kitty home to meet Fido or Fluffy can be a hair-raising experience for not only the owner but also the resident pets—if not handled correctly. A peaceful relationship between new and existing feline or canine housemates requires time, patience and work. The introduction process generally takes a few weeks before the pets are all cohabitating peacefully. At times, though, it can take several weeks. The trick is to do it slowly and cautiously…and follow the guidelines below.People who don’t like cats tend to also avert their eyes or look at them for just a moment at a time. For some reason, cats like this from new people! So don’t stare right into kitty’s eyes for a long period of time. When you do have her attention, do a slow blink. This means that you close your eyes slowly, hold them closed for a minute, and then open them slowly while looking at the cat. , this means “I love you.”People who don’t like cats also tend to be slower in their movements. Don’t squeal over a new cat and try to pet her too fast or rough when she approaches you. Instead, just offer your hand to her, knuckles first. Give her a chance to sniff your hand and get used to your scent. Then she may push your hand with her head. Pet her softly and not for too long at first. With a new cat, it’s all about playing hard to get.Before choosing a new adult cat or kitten, it is important to take time to research and think about your options. A cat's personality, age, and appearance, as well as the kinds of pets you already have at home, are all things you should keep in mind when choosing a cat. And if you've never owned a cat before, it's also important to know in advance exactly what taking care of your new cat will involve. Some cats are just too shy or too feral to bond with the first time you meet them. If a new cat is hissing, twitching her tail, hissing, or just running away from you, don’t try to pet her. If you extend your hand and she runs away like she’s scared, then don’t reach out to her again until she approaches you and gets even closer to you. Shy cats need to feel like they’re in charge of the interactions.If you're bringing a new cat into your home, be patient. The introduction must be gradual. Following the initial introduction, it can take a very long time for a relationship to grow. It takes most cats eight to 12 months to develop a friendship with a new cat. Although some cats certainly become close friends, others never do. Many cats who don't become buddies learn to avoid each other, but some cats fight when introduced and continue to do so until one of the cats must be re-homed.