Biden is expected to announce the delivery of ATACMS to Ukraine during the next Ramstein meeting on the 19th of this month. Considering how Ukraine already operates HIMARS and GMLRS it won't take them more than a few weeks to train on ATACMS, which is deployed from the same launchers as them.
By late October or early November massive three and a half thousand pound ballistic missiles will start raining all over the Russian Black Sea fleet in Crimea. The timing of this move indicates that US is finally allowing Ukraine to sink the Russian Black Sea Fleet in response to the termination of the grain deal. Just yesterday, Ukraine captured strategically located oil rigs in the Black Sea from Russia. Once the Russian Navy is destroyed, Russia will have very little incentive to continue its war in Ukraine.