From USCIS: 

WASHINGTON – U.S. Citizenship and Immigration Services has reached the congressionally mandated 65,000 visa H-1B cap for fiscal year 2018. USCIS has also received enough H-1B petitions to meet the 20,000 visa U.S. advanced degree exemption (master’s cap).

USCIS will reject and return filing fees for all non-selected cap-subject petitions that are not duplicate filings. 

USCIS will continue to accept and process petitions that are otherwise exempt from the cap.  Please remember that USCIS suspended premium processing April 3 for up to six months for all H-1B petitions, including cap-exempt petitions. Petitions filed on behalf of current H-1B workers who have been counted previously against the cap, and who still retain their cap number, will also not be counted toward the congressionally mandated FY 2018 H-1B cap. USCIS will continue to accept and process petitions filed to:

• Extend the amount of time a current H-1B worker may remain in the United States;
• Change the terms of employment for current H-1B workers;
• Allow current H-1B workers to change employers; and
• Allow current H-1B workers to work concurrently in a second H-1B position.