Yes, if you don't have a need for the 1040-ES vouchers for 2018, you may disregard them.
They print automatically if there was a spike in your income for things like a retirement distribution, stock sale, etc. But they are not required to be mailed or paid.
https://ttlc.intuit.com/questions/1901092-why-did-1040-es-estimated-tax-vouchers-print-out-do-i-need...
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