Baby-proofing 👶🏼

I'm switching my baby's room with our office, but I'm wondering when I'll need to start baby proofing? As in outlet covers, anchoring furniture, etc. LO is just 3 months. When do they usually start crawling and moving? She will roll and cruise with help, but I'm assuming I'll have months to do this before she's really mobile?? I want her room safe but I haven't even looked into baby proofing yet. Anyone with experience?