I adopted my greyhounds while working full-time, I was local so could nip home in my lunch hour then and later had a dog walker. If you have a garden they could run about in you can reduce costs by having 2nd as shorter home visit and my dog walker also offered half hour walks for some dogs out of the prime midday slots. The hounds would sleep lot of the day when I WFH anyway. Some dogs can struggle with separation anxiety which is not always known while in kennel environment as they've other dogs & people about.
Unless small home boarder who can cater to their needs better I suspect they'd have found typical doggy daycare too much as after 5mins run about they need to recharge their batteries for most of the day, also quite reliant on them being supervised well as other breeds often don't enjoy their chase games and they've skin like paper so harmless roughhousing can leave them with an injury.
It can get hard as spontaneous plans are no longer possible and always on timer while out of when need to get back to the dog so this can be harder as a single person. If been out at work it's unfair to be out in evening too. Also fewer dog walkers offer weekend & evening cover so can impact on social life. If family aren't local may need to budget boarding costs for Christmas/ visits, although it's much easier to take dogs away with you now to hotels/self catering, but you usually can't leave them unsupervised.
Food isn't too difficult to find decent for reasonable budget I fed autarky salmon which is vat free and bag last a month but what you want to feed and what suits their digestion differs. There lot of little extras that tend to add up though non and vet bills, I'm in cheap area & consults are £40-60 and out of hours £250+ just to be seen, specialist vets are £150-400 for consult and you can easily go through £7k if need MRI diagnostics(£1.5-3k), surgery or longer inpatient care.
Greyhounds aren't cheap to insure but still relatively healthy for pedigree given bred for function over form, it's often running injuries or dental, arthritis is likely though don't tend to get hip/elbow dysplasia like many large breeds. Unlike most types insurance, pets have to buy with future in mind as can't easily switch insurers once have anything noted in vet records it become pre-existing and excluded in group so all lumps, bowel etc. The cover doesn't increase so what may seem plenty now may not be in 5-10yrs
i went with petplan with most recent dogs which is more expensive but worthwhile as covered full lifetime, never quibbled claims, pay fast so most vets accept direct claim so don't have to pay first & reclaim yourself. They also covered dentals which few do and don't penalise individual for claims so can put all through, they allow a year to claim so for ongoing condition the small costs soon add up over the excess. Many insurers start cheap and then rise faster annually, they also tend to hike premiums after claims or when the dog hits senior years as deemed higher risk but have you over a barrel by then, pay up loss pre-existing if switch & 8yr+ hard to get lifetime cover so many end up uninsured and self funding when they needed it most.