What are the chances of getting a detached retina right after cataract surgery?

Low. During cataract surgery the eye decompresses and this causes the vitreous jelly to create traction and pull on the retina. The jelly may then separate from the retina and tear a hole. This hole can lead to a detachment. It is uncommon but it can happen in a small % of cases.
Rare. The chances of having a retinal detachment surgery immediately postop are rare. If your surgery was complicated, you have a history of prior retinal detachment, or high near-sightedness, your risk is a little higher but it would still be very uncommon.
Uncommon. One out of many thousands, but can depend on the surgeon, pre-existing eye conditions, and complications with the cataract surgery.

Related Questions

What would experts say about % chance of a retinal detachment occurring after cataract surgery?

Very low. Depending on risk factors (history of rd, retinal holes, myopia, previous trauma, etc), the risk of rd in an uncomplicated cataract surgery is very low less than 1%.
1-2% The risk of retinal detachment after cataract surgery is between 1-d2%. According to a study in 2006, a variety of risk factors contribute to the formation of rd after cataract surgery. These include having had an rd before, a tear in the capsule and dehiscence of zonules. Nd:yag laser treatment did not increase risk.
Very low... Very low, but this is one of the risks that surgeons consider when offering surgery to a patient. The benefits of surgery must outweigh the risks.