Yes, you can both create logins, but there is not going to be any update between receipt and approval of the petition, unless they send an RFE. What is happening is they are adjudicating a petition, not processing any application. Note that USCIS does not issue visas. You approved petition will be sent to the National Visa Center, part of Dept. of State, then on to the US Consulate in London. Watch your emails and US Postal mail. This is a hurry up and wait process. Your petition is just sitting waiting its turn for a human to spend about 20 minutes with it, usually just once.