This is the boring, but very necessary waiting game. You've gotta leave your trimmings to just do their thing for the next 4-6 weeks. As the water evaporates, you'll want to refill with fresh h2O, so that the nodes and new roots remain submerged. If there's any signs of murkiness or mildew, tip out the jars and rinse the roots, before replacing with fresh water.
Depending on your environment, you should see growth within 1-2 months and once your roots reach an inch or longer, they're generally ready to be potted.
Once you reach this stage, you want to consider transplanting them to soil. If you leave them too long in water, you run the risk of them acclimatising to the jars and becoming water plants — which means they may not survive a repotting further down the line.