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 June
15, 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."