But the strikes on eastern Syria and in western Iraq were large, and targeted IRGC assets and personnel and their affiliates. According to a CENTCOM statement, the initial wave, which started at 4pm US Eastern Time (interestingly, just after markets closed), included over 85 targets, with some of them hit more than once:

At 4:00 p.m. (EST) Feb. 02, U.S. Central Command (CENTCOM) forces conducted airstrikes in Iraq and Syria against Iran's Islamic Revolutionary Guards Corps (IRGC) Quds Force and affiliated militia groups. U.S. military forces struck more than 85 targets, with numerous aircraft to include long-range bombers flown from United States.

The airstrikes employed more than 125 precision munitions. The facilities that were struck included command and control operations centers, intelligence centers, rockets, and missiles, and unmanned aerial vehicle storages, and logistics and munition supply chain facilities of militia groups and their IRGC sponsors who facilitated attacks against U.S. and Coalition forces.

The Biden administration is promising this is not the end of it, and the campaign could last for days or more.

Update(1640ET): The Biden administration has begun its much anticipated retaliatory strikes: 

FIRST US MILITARY RETALIATORY STRIKES UNDERWAY IN SYRIA: ABC