Last November I noted that the USA was barely managing to hold onto its lead over China in scientific research as measured by articles in the Scopus database. At the time, there were 346,425 articles with a Chinese affiliation and 352,275 with a US affiliation for 2017.
As of today, there are 395,597 Chinese and 406,200 US articles dated 2017.
For 2018 so far, the numbers are 53,941 Chinese and 49,428 US.
There are other document types listed in Scopus and perhaps the situation may change over the course of the year.
Also, the United States still has a smaller population so it maintains its lead in per capita research production. For the moment.