Sorry chief this is one of those things that's so universally observed and understood it's a bit ridiculous to ask for a source. The first search result says:

Average US tariffs on Chinese exports now stand at 47.5 percent and cover 100 percent of all goods. China's average tariffs on US exports are at 31.9 percent and cover 100 percent of all goods. US tariffs have risen by 26.8 percentage points since the second Trump administration began on January 20, 2025. Chinese tariffs have risen by 10.7 percentage points over the same period.

Average US tariffs on imports from China had increased to 127.2 percent in early May 2025, before later being reduced. The second Trump administration had reached those heights by increasing tariffs on imports from China through a number of different actions, not all of which were China-specific.

https://www.piie.com/research/piie-charts/2019/us-china-trade-war-tariffs-date-chart