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sorry, mate. I took you wrong. I have edited my post.

дождусь is clearly the Future Tense, but the whole fixed expression "Жду не дождусь" can only be used in the present tense in grammatical sense, but can refer to events in the past.

"я жду не дождусь", "они ждут не дождутся", "ты ждешь не дождешься"-
is used only in colloquial language in the Present Tense only. It emphesizes impatience as waiting for something good or pleasant.