Need help with Bernats Men's Dropshoulder Sweater

Hi all,
New to knitting sweaters and I am getting stuck on this part and don´t want to mess up. Can someone please explain to a newbie what exactly this means?
Thanks for supporting a male knitter :-)

Shoulders: Cast off 30 sts beg next 2 rows. Leave rem 35 (35-37-39-39) sts on a st holder.

does this mean cast off 30 on the right side -knit the rest of the row
then cast off 30 on the left side- until I reach the neck (rem 35 st)

full pattern-