If you managed to file your personal income tax return for the 2020 tax year by April 30, 2021, your new benefits year/amounts start in July.
GST/HST credit-July 5 direct deposit; allow 5 business days after this date for mailed cheques to reach you.
Ontario Tax Benefit-July 10 for direct deposit; allow 5 extra mailing days for cheques.
If you are eligible for tax credits but filed after April 30, your credit mailing/direct deposit date for the first month will be delayed.
If you did not file your personal tax return at all, well you won't receive any eligible tax credits until you file and wait the requisite 6-8 weeks for your notice of assessment, then the later benefits letter/e-mail.