Couple of questions on ILR. Im currently pulling together my application for ILR 5 yr route off a Tier 2 Sponsorship Visa. I had planned to travel back to my home country in a couple of months, having used the priority service to speed up my application. Ive just discovered these are all suspended until further notice!

My Visa expires 27 Dec 2020, and Im considering travelling back home, to arrive back in the UK the day my Visa expires.
So the question - can I apply for ILR the very same day my current Tier 2 expires? Would that be classed as a late application or not? I would have everything prepared ready to submit online that very day I land back in the UK. Would airport officials have any issue with letting me back in ?
Second one - My family receive Child Benefit, which is accessed legally through my husband who is a British Citizen. Theres a question on the application about this and whether I receive public funds. Should I say yes? Im unsure if I need to declare it since it is granted to him not myself? I dont want to get tripped up if they see payments in our joint account. Likewise I have no recourse to public funds so I dont know if that will cause any issue(it shouldnt as it is obtained legally through hubby)
Thanks in advance,