Yes, TABLES is a Scrabble word!

Letter values in Scrabble US: T 1, A 1, B 3, L 1, E 1, S 1.

Is it a valid word?

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

a set of data arranged in rows and columns
a piece of furniture having a smooth flat top that is usually supported by one or more vertical legs
a piece of furniture with tableware for a meal laid out on it
flat tableland with steep edges
a company of people assembled at a table for a meal or game
food or meals in general

Also: tabular array, hold over, put over, set back, put off.

Not playable in Scrabble US: TABULARIZE, TABULARISE.