In time to actually make a major difference?
Almost none. Most of the killing was completed before any of the local states could get their forces ready to go.
There is also the not minor problem that the neighboring military forces are "regime protection" forces, not expeditionary forces. They are equipped (poorly it must be noted) and trained to defend against a rebellion. Offensive operations requires both different training than manning roadblocks, protecting government facilities, etc. and requires vastly more logistical capability. The number of countries on the African continent with a serious force projection capacity can be counted on one hand, with space left over (Egypt, Nigeria, and South Africa being the major players), none of them are capable of projecting out over a thousand miles from home. This was a scenario that would strain the capabilities of the United States, expecting any African state to manage it is a bit unfair.
The best chance of intervening was when the evacuation of Western civilians took place, three days into the Genocide the death toll by then was probably pushing 200k. Unfortunately the UN as an organization screwed the pooch and maintained its stance that the UN mission in Rwanda was not permitted to take military action (This was so bad that ten Belgian troops assigned to guard the PM were killed after their CO ordered them to surrender. His understanding of the RoE prohibited them from combat, even in self defense. They surrendered and were quickly murdered).