Yes, PROGRESSIVES is a Scrabble word!

Letter values in Scrabble US: P 3, R 1, O 1, G 2, R 1, E 1, S 1, S 1, I 1, V 4, E 1, S 1.

Is it a valid word?

PROGRESSIVES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a tense of verbs used in describing action that is on-going
a person who favors a political philosophy of progress and reform and the protection of civil liberties

Also: progressive tense, imperfect tense, continuous tense.