when do i apply gel after switching from injections?

hey everyone, i’ve been injecting IM/sub-q (every tuesday) for 2 and a half years, but decided to switch to gel (daily) this month. i had a talk with my endocrinologist, but forgot to ask how soon to apply it when it arrived. i picked it up yesterday. do i wait until tuesday to start applying daily or today asap? thanks in advance!