Based upon how you describe your manager's comments, it would appear that you are already unemployed, because if your position has been filled and there are no other openings, then you don't have a job. Which means that you can apply for unemployment benefits after waiting one week (7 days) from the date that you were terminated (apparently the date that you received the notice from your manager concerning your job).
And, each week that you wait to apply, reduces your payment benefit, because your payment is based upon your highest earnings during the first four of the past five calendar quarters. So, as each week passes, the amoung of wages that fall within those four quarters decreases.
To file a UI claim, see this link
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