does metering work if in manual?

My question is as such, given that you use strobes and set the lights of the sekonic. I have read on this and still not sure. Can someone please verify this for me?

Thank You

I suppose you mean the in camera light meter? Sure it works, it measures the ambient light (modelling and room lights). That's why you use 'M' with (studio) flashes, so you set the shutterspeed, not the camera

The built-in light meter works in all of Canon's DSLR's when in "M" mode. However, it cannot read lighting from flash sources. All it is capable of reading is "continuous" lighting - light from ordinary sources such as the sun, household lamps, etc.

A handheld meter such as the Sekonic L-358 is extremely useful for measuring light from studio flash sources.

The L-358 (and a lot of other handheld meters) also have a very significant advantage over the meters built into cameras. That is the ability to make "incident" light readings - measuring the light falling on the subject instead of the light reflected from the subject. Incident light meters greatly simplify otherwise tricky metering situations that fool reflected light meters. A typical "tricky" situation where incident readings really are an advantage would be a wedding - the bride in a white dress next to the groom in a black tuxedo.