I accidentally set up a payment plan to pay 2018 tax bill. I’ve already filed. Can I make a lump sum payment to avoid fees?

When we realized we owed more than $2k on taxes this year, I had played around with turbotax’s Online forms and was trying to figure out if there were penalties for paying in installments. 

Apparently I left it like that even though I have the money to pay what we owe now. Can I send a lump sum payment to the IRS with my 1040-V