此処ぞ - JP-EN Jisho

此(こ)処(こ)ぞ

expressions (phrases, clauses, etc.)word usually written using kana alone

now is the (important) time; this is the (critical) moment; this is when it matters; this is the place

usu. as 〜という時, 〜というところ, 〜とばかり, etc.