I think Izuku, with all his quirks, still have a lot of catching up to do
In their fight against ending, both bakugo and todoroki showed that they had a way faster base speed. What's more is that when bakugo uses condensed explosions, his speed goes way beyond even that. Todoroki also got really good AP with his flashfire development.
But as for Deku? he can't even maintain black whip for an extended period of time and his mastery of it puts him far away from being the "Spiderman of boku no hero."
Hopefully, I think he'll do a lot to catch up to the two within this time skip.
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Float seems like a relatively straight forward quirk, it simply allows you to float. As opposed to flight, which allows you to have powered flight, and zero gravity, which allows you to make other things float as well.
I don't think it will be nearly as difficult to master as black whip or the base OFA power was and I see Deku coming out of the timeskip with both float and black whip fully mastered.
I think float will just make Deku weightless and that he will need to use Air Force kicks or black whip if he really wants to have flight.
Also, I think Deku needs to go beyond 20% full cowl. As to how he will do this, I think he'll have to utilize black whip, which he surely must have mastered at this point. I think Izuku will cover his entire body in black whip, and use black whip to enhance his physical capabilities, allowing him to reach 30, 40, or possibly even 50%, albeit it might have some sort of time limit. I think this form will probably be inspired by Venom.