https://www.crucial.com/usa/en/compatible-upgrade-for/Dell/optiplex-9010-(small-form-factor)
I think it will work for what you want to do. I would try it with the 8 GB of ram if you need more down the road I put a link in here for you. Like Tony said 8 GB is the sweet spot for Windows unless you are going to do more demanding things. I have a Lenovo desktop with 8 GB of ram and it is pretty speedy. I have a customer that buys nothing but Dell refurbished computers and he has had great luck. I believe that with the SSD in it it will run just fine they do add speed. Also it has a quad core processor running at 3.20 Ghz that is a decent speed , so all combined I believe it will work for you.
Go to www.crucial.com. Have it scan your computer. It’ll tell you what you have and what upgrades are available.
Usually, 8 GB RAM is enough. You may have more demanding needs such as gaming, running virtual machines, video or photo editing.