I believe importing 110V into KSA is not allowed. I'd dont know how rigorously it is enforced for personal belongings. I'm also not sure what the current status of housing electrics is on Aramco. Certainly most places in Saudi are all 220V, which will make things explode if you get it wrong, and cost a fortune in step-up transformers. But equally, check your plugs - many are dual voltage these days, particularly with laptops, phones etc.
There is an ongoing programme to convert all on camp homes to 220V. Between it being KSA and the usual contractors that seem to be involved it seems to be a slow and laborious process. Historically 120V electrical equipment carried a premium in Aramco, not so much now.
Most modern electronics are just fine whether on 120V or 220V as the power supplies are dual voltage. TV's, computers, printer etc. generally will be ok.
I don't know what housing you are assigned to. I just moved about a week ago and most of the outlets are 120V. They installed 220v outlets only in one in the living room, one in the kitchen and one in the dining room so it is not many. I shipped most of my 120V appliances from Houston and they are on its way.