Pretty much what Shagnasty said.
Walk the dog around like it’s no big deal, nothing to see here, walk past the cat a couple times. Since the cat most likely won’t come to you, holding a short leash (not taut, no tension on the leash but short enough that if the dog lunges/ cat attacks you can pull back quickly) walk up with the dog in a casual way. If at any point the cat looks like it is going to break and run (which can trigger a predatory response from the dog) turn around and walk out with the dog, praising him for being a good boy or whatever.
If the dog is rigid/shaking or pulling hard with excitement to meet the cat, take the dog out like you just wanted to take a walk around the yard anyway. Speak in a soothing voice throughout, don’t make the cat the main objective in the room, because it can set up the expectation of the cat as a target. Take it slow and easy.
It’s a fine line–some dogs are completely disinterested, but when the cat runs, it’s snacktime. Others can seem overstimulated and excited but as soon as the novelty wears off, the cat is just the thing which produces delicious little clay-crumb coated sausages & nothing more.
In the first month when the cat and dog are together in a room, you’ll need to be there and the dog should be on a leash, it can be a nice long training lead so you don’t have to hold it all the time, just step on it if there’s a problem, or you can hook a 6’ to you and work on the bonding and heel. A new dog in the house should be started from square one just like a puppy anyway.
The two should never be left alone unsupervised together until, well, time values are a bit arbitrary because everyone’s different, but two months. That should be plenty of time to assess how much potential for trouble there is. Some animals are mischief-makers while they’re home alone, so better safe than sorry.
I used to do dog-cat safe testing at a rescue and adoption counseling. I hope this info was helpful. I love SHs; high energy but worth it, the ones I’ve known were big hairy lovey clowns. A blowing coat is quite a sight to behold.
Good luck!