Could anyone help me in how to view or how to check area power and timing report after synthesis using yosys?

you won't get power after synthesis AFAIK, but you can get an area ESTIMATE by looking at the report

Could you please explain me when and where I need to check the reports.

After you run the tools you get a new directory in the runs directory

@Matt Venn Actually you can get the power after synthesis. There is a file

openlane/scripts/sta.tcl

In there you would find a line

#report_power

If you uncomment this line, it would tell you the power after synthesis. @Dhayalakumar M

thank you venn and hasan.