Can I make a payment now for Federal taxes that might be owed in 2021?

My wife retired in Jan 2021.  I've been retired for a few years.  Our income is mostly from Social Security now.  My wife had about $7000 in gross income in January of 2021 as she worked for about 3 weeks prior to retirement.  I have a small pension of about $2000 per year.

 

Having a lower income I decided not to have Federal taxes deducted from our SS payments.  After reading up on my situation I think I might owe more Federal taxes for 2021 that were withheld.  Not wanting to run afoul of the greater than $999.00 limit on what I owe in taxes I want to make a payment to the IRS now for 2021.

 

I see there are online payment options on the IRS site. Are any of these what I want?  The bottom line is that I hopefully come in under the $1000.00 limit.

 

A link to whatever I need to do to accomplish this would be greatly appreciated.