I'm pretty sure I saw something here a month or so ago, to the effect that the estimated Federal tax payment due on June 15th had _not_ been deferred to July 15th. But I could be mistaken about that.
In any case, this IRS notice, dated April 9th, explicitly extends the deadline for second quarter estimated payments from June 15h to July
15th:
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"Besides the April 15 estimated tax payment previously extended, today?s notice also extends relief to estimated tax payments due June15, 2020. This means that any individual or corporation that has a quarterly estimated tax payment due on or after April 1, 2020, and before July 15, 2020, can wait until July 15 to make that payment, without penalty."