Breast pumps

At what point do you get a breast pump if I'm going through insurance? I'm 5 months right now, I wasn't sure how long the process takes but I figured I don't want to do it too early either in case there's something wrong with it. What types of pumps do insurances usually cover? I'm going to be pumping and supplementing with formula not breastfeeding (don't judge me I don't want to hear it) so I've read that a double electric pump might be best. This is my first so I appreciate any feedback