Keep it on your phone, print a copy if you like. When you go thru immigration if they ask show them either copy. Just as a point of note, as you head towards immigration you will see a huddle of people on your left hand side at desks marked up as TDAC. Ignore that huddle and the desks as you already have yours, go straight to an immigration desk.
the monthly income method is 65'000Baht and to be shown as a monthly internal transfer. The combination method doesn't necessarily work at all Immigration Offices (IO). It cannot be used at my local IO.