The chart above reflects the results of the latest Reuters / Ipsos Poll -- done on January 20th and 21st of a national sample of 1,115 adults (including 950 registered voters). The margin of error for adults is 3.3 points and for registered voters is 3.6 points.
It shows that 55% of the public approves of the job President Biden has done in his first days on the job (including 57% of registered voters, 92% of Democrats, 52% of Independents, and 21% of Republicans).
NOTE -- Donald Trump never received a majority job approval at any time during his four years in office.