Can you tap meter and feed panel in detached garage?

No. Any connections to the detached garage have to be after the main disconnect of your house panel.

You have two options here. You can replace meter with a meter disconnect combo and have the main feed your house and add a breaker to feed the garage or You could install a 400 ap service and place two disconnects at the meter. one for the house and one for the garage.

unless you are going to have a serious electrial load in the garage you sould just feed off the panel in the house for cost effectiveness.