Well, since this is basically a zone 7b (and warmer) shrub, you'll be gambling a bit growing it outdoors in your zone. It will need wind protection in winter as well as winter shade in your zone and you can expect dieback or death if we have another polar vortex outbreak. If you can provide shelter, as well as maybe throwing a large pot or tarp over it during very cold outbreaks, you might be able to enjoy it for many years ... maybe.

Regarding indoors, if you have a cool room, conservatory, or three-season room with good light, it should do fine. When I say cool, it will enjoy winter temps from 45 to 60 degrees with a bit of a warmup during the day. Then in summer it will need to go outside in part sun.

Your call.

Ok but if grown in pots, will they reliably bloom or bloom at all? I am seeing some people's reviews of this plant in Dave's garden website and many are saying it hasn't bloomed for them yet even after 10 years. So I'm a little worried that this plant is very fussy on blooming.

If it's in a pot AND getting the right conditions, I don't see why it wouldn't bloom some day. But I have no experience with Osmanthus in a pot.

But one can only speculate what other 'Dave's Gardeners' are doing wrong. You'd have to know exactly what kind of environment they are providing it. It could be sitting in a dark corner, not getting enough light, or it may not be outdoors in summer. Or it could be pest-ridden. No way to know unless you ask them.

Well this guy says this:

"For whatever reason this Osmanthus has never bloomed very much for me in zone 8b coastal SC. It is getting afternoon sun and I think it is getting enough, but maybe not. It is at least 10 ft tall and the foliage is very dense, unlike my other tea olives. Was expecting a lot more in the way of flowering."

He's in the perfect zone to grow this plant, has no pests judging from how he says the leaves are very dense, good amount of sun, 10 feet tall. I don't see any reason why his couldn't be blooming. This one post discourages me from growing this because this guy has it in the ground with perfect conditions for this plant and not even blooming so how can I possibly have it to bloom in a container?? Sigh I really want this plant for the blooms

Actually I will try giving it a shot in pots. Nothing to lose than a couple extra bucks I guess. So will they do ok in a 5-1-1 mix? And do you know if they have deep root systems or shallow? I am thinking of getting something like a 4 feet deep pot and maybe 5 feet or more wide

I did a quick google and found this (on Wiki):

Osmanthus flower on old wood and produce more flowers if
unpruned. A pruned shrub often produces few or no flowers for one to
five or more years, before the new growth matures sufficiently to start
flowering.

Who knows. Maybe the guy on Dave's site prunes his Osmanthus a little enthusiastically. Maybe not. Anyhow, glad you're going to give it a go.

Also, you could try one in your garden too. Choose the best site and you never know...

Well even if I don't prune it it might get a lot of dieback from the cold if I plant it in the ground. So I will try it in pots but one thing that is still holding me back is the ultimate size of this plant. I don't want to deal with a 20 footer giant and repot every 3 years and lift it up to put it in a new pot. How am I going to get the 20 footer out of the pot in the first place?