My daughter is 5 months and rolling tummy to back only, has great strength and can weightbare through her hands to lift her head and torso off the ground but won’t roll tummy to back, I’m worried about if she rolls in her sleep, she sleeps 7+ hours and so do I do she could possibly be on her tummy for 7 hours unless she wakes me, I’m worried about the SIDS risk, she is arms out in her cot

Are you saying she is rolling back to tummy, but not tummy to back?
Does she roll both ways when doing tummy time when awake?
Is she rolling to her tummy during sleep?

Important that she is in cot now & not swaddled (as you have done) as she will soon most likely roll from back to tummy for sleep.
She needs the extra space & arms free to roll safely.
Most babies start rolling to tummy for sleep between 4-6mths - this is normal.

Also, ensure that the cot mattress is firm & flat & there is nothing soft or loose in her cot,
Always continue to place baby on back to sleep. (even when rolling)
Increasing tummy time when awake.

Red Nose has the following information now that your baby is starting to roll.

Give baby extra tummy time to play when awake and supervised as this helps baby to develop stronger neck and upper body muscles which in turn enables them to roll back over.
Make sure that baby is on a firm and well-fitting mattress that is flat (not tilted or elevated).
Make sure that baby’s face and head remains uncovered (do not use lambswool, doonas, pillows, cot bumpers or soft toys)

As babies grow and develop they become very active and learn to roll around the cot.
At this time, continue to put them on the back at the start of sleep time, but let them find their own position of comfort.
By this stage it is not necessary to wake during the night to turn baby over to the back position

Do not use any devices designed to keep baby in a particular sleep position.
https://rednose.org.au/article/what-do-we-do-now-that-a-baby-has-started-to-roll-over